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…o 2.7.0 (#18499)

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Use richer `previewtypes.Parameter` for `wsbuilder`. This is a pre-requirement to adding dynamic parameter validation.

The richer type contains more information than the `db` parameter, so the conversion is lossless.

Using the db.Store when in a TX causes a deadlock for dbmem.
In production, this can cause a deadlock if at the current conn pool
limit.

Parallel concurrent queries cannot be run in the same tx

Was getting this error: https://stackoverflow.com/questions/78472996/go-postgres-pq-unexpected-parse-response-c-with-queryrow

# What does this do?

This does parameter validation for dynamic parameters in `wsbuilder`. All input parameters are validated in `coder/coder` before being sent to terraform.

The heart of this PR is [`ResolveParameters`](https://github.com/coder/coder/blob/b65001e89c0577199a8e470c138c51e91cf2350c/coderd/dynamicparameters/resolver.go#L30-L30).

# What else changes?

`wsbuilder` now needs to load the terraform files into memory to succeed. This does add a larger memory requirement to workspace builds.

# Future work

- Sort autostart handling workspaces by template version id. So workspaces with the same template version only load the terraform files once from the db, and store them in the cache.