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Jon Ross-Perkins 3822c1b526 Split github_tools into its own bazel repo. (#3632 )

The pip dependencies in github_tools are the reason the
MODULE.bazel.lock is platform-dependent. Following complaints about the
platform-dependence, split apart github_tools from the rest of the bazel
repo and make it not track the lockfile: while there's an incremental
safety risk due to not tracking checksums, it's unlikely the tools there
would ever be part of a Carbon release process. If we eventually add
Python tools that need pip to the release, it might be desirable to go
back to re-unify the bazezl repos.

This does make running pr_comments incrementally more inconvenient
because a "bazel run" needs to be run from the github_tools subdir.

As a consequence of separating the dependency, this means tests will not
be continuously run in github_tools. They're now a separate repo, and we
cannot add a dependency without restoring the platform-dependent issue.
I think pr_comments is sufficiently low value and unchanging that it is
not worth building separate CI for it.

Cleans up some legacy references to third_party/llvm-project, since now
github_tools needs to be added to the main bazelignore.

2024-01-22 21:34:02 +00:00