…2255)

Classes that inherited a generic without specifying all type parameters were not generated. Filling the ones not specified with `JObject?`.

…[Mutable]Set` (#2234)

Bug: #2273

This PR makes `dart test` in packages `hooks`, `hooks_runner`, `code_assets` and `data_assets` pass.

This PR makes `dart test` in `package:native_toolchain_c` partially pass. The tests that are still failing are the cross-compiling tests from linux_x64 to linux_non-x64.

Changes required to discover the toolchains on the NixOS vm of FireBase studio:

* Adds the installation path of the Android NDK to the default installation paths. (It would be better if we got this from `ANDROID_HOME` or `ANDROID_SDK_ROOT`.)
* Enables discovering `llvm-ar` and `ld.lld` on the PATH. They are in separate install locations in NixOS.
* Prefer `ld.lld` over `ld` from GCC when not cross compiling in `CLinker` (more likely to be available).

In addition this PR commits the `.idx/dev.nix` NixOS config so that new checkouts in FireBase studio will automatically pull in the right dependencies.

* Add versions to gradle dependencies of jnigen
* Add versions to gradle dependencies of jni
* [jnigen] Generate Kotlin classes without providing path