* Failing test for #900

* Add a delimiter to the path

Missing delimiter strikes again

* Fix auto PATH ordering

In #900, I observed that the path of a layer's `./bin` dir (if present) is appended to any explicitly added paths by CNB lifecycle. Libcnb instead prepends the path.

This is fixed to match the upstream implementation by changing the order of path evaluation.

Close #900

* Test Build and Launch scope

* Expected before actual in assertion

* Test LIBRARY_PATH ordering

* Changelog

* Doc whitespace and headers

* Update docs s/append/prepend/

The docs stated that we're appending the layer-bin path. With this change we're now prepending it to align with lifecycle.

* Simplify layer_paths_come_before_manually_added_paths test

* Emit scope and path on failure

Before:

```
thread 'layer_env::tests::layer_paths_come_before_manually_added_paths' panicked at libcnb/src/layer_env.rs:944:13:
assertion `left == right` failed
  left: Some("/var/folders/yr/yytf3z3n3q336f1tj2b2j0gw0000gn/T/.tmpKPAfq0/bin:test-value")
 right: Some("test-value/var/folders/yr/yytf3z3n3q336f1tj2b2j0gw0000gn/T/.tmpKPAfq0/bin")
```

After:

```
thread 'layer_env::tests::layer_paths_come_before_manually_added_paths' panicked at libcnb/src/layer_env.rs:944:13:
assertion `left == right` failed: For ENV var `PATH` scope `Build`
  left: Some("/var/folders/yr/yytf3z3n3q336f1tj2b2j0gw0000gn/T/.tmpaCmToR/bin:test-value")
 right: Some("test-value/var/folders/yr/yytf3z3n3q336f1tj2b2j0gw0000gn/T/.tmpaCmToR/bin")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

* Apply suggestions from code review

Co-authored-by: Manuel Fuchs <[email protected]>
Signed-off-by: Richard Schneeman <[email protected]>

---------

Signed-off-by: Richard Schneeman <[email protected]>
Co-authored-by: Manuel Fuchs <[email protected]>

---
updated-dependencies:
- dependency-name: Swatinem/rust-cache
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
- dependency-name: buildpacks/github-actions
  dependency-version: 5.9.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
- dependency-name: softprops/action-gh-release
  dependency-version: 2.3.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Updates the requirements on [which](https://github.com/harryfei/which-rs) to permit the latest version.
- [Release notes](https://github.com/harryfei/which-rs/releases)
- [Changelog](https://github.com/harryfei/which-rs/blob/master/CHANGELOG.md)
- [Commits](harryfei/which-rs@7.0.3...8.0.0)

---
updated-dependencies:
- dependency-name: which
  dependency-version: 8.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Updates the requirements on [fancy-regex](https://github.com/fancy-regex/fancy-regex) to permit the latest version.
- [Release notes](https://github.com/fancy-regex/fancy-regex/releases)
- [Changelog](https://github.com/fancy-regex/fancy-regex/blob/main/CHANGELOG.md)
- [Commits](fancy-regex/fancy-regex@0.14.0...0.16.0)

---
updated-dependencies:
- dependency-name: fancy-regex
  dependency-version: 0.16.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps the github-actions group with 1 update: [buildpacks/github-actions](https://github.com/buildpacks/github-actions).


Updates `buildpacks/github-actions` from 5.9.2 to 5.9.3
- [Release notes](https://github.com/buildpacks/github-actions/releases)
- [Commits](buildpacks/github-actions@bc04fbf...8203df0)

---
updated-dependencies:
- dependency-name: buildpacks/github-actions
  dependency-version: 5.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Update toml requirement from 0.8.22 to 0.9.4

Updates the requirements on [toml](https://github.com/toml-rs/toml) to permit the latest version.
- [Commits](toml-rs/toml@toml-v0.8.22...toml-v0.8.23)

---
updated-dependencies:
- dependency-name: toml
  dependency-version: 0.8.23
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* Fix TOML error spans in unit tests

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Manuel Fuchs <[email protected]>

* Update cargo_metadata requirement from 0.19.2 to 0.20.0

Updates the requirements on [cargo_metadata](https://github.com/oli-obk/cargo_metadata) to permit the latest version.
- [Release notes](https://github.com/oli-obk/cargo_metadata/releases)
- [Changelog](https://github.com/oli-obk/cargo_metadata/blob/main/CHANGELOG.md)
- [Commits](oli-obk/cargo_metadata@0.19.2...0.20.0)

---
updated-dependencies:
- dependency-name: cargo_metadata
  dependency-version: 0.20.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* Fix compile error

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Manuel Fuchs <[email protected]>

Co-authored-by: heroku-linguist[bot] <136119646+heroku-linguist[bot]@users.noreply.github.com>