rev_sdk_deps tool links PR ids to SDK issues

[parlough]

Currently the rev_sdk_deps.dart tool includes the full commit messages from the git log, but these often include PR IDs at the end. For example in 540b3a8:

lints (https://github.com/dart-lang/lints/compare/975c687..2cf8403):
  2cf8403  2023-10-23  Devon Carew  ... (#165)
                                         ^^^^

GitHub automatically links these to issues/PRs in the SDK repository, and (incorrectly) indicates on the issue that the DEPS rev commit referenced it. For example, the earlier example linked to #165.

If a pull request is the last item present in the commit message, the tool should be updated to either:

1. Find and replace it with a prefixed version (In this case, prefix ID with https://github.com/dart-lang/lints/pulls)
2. Find and replace it with a version using inline code syntax (In this case, replace (#165) with `(#165)`)
3. Remove the PR id completely.

I think the first is preferable so those referring to the DEPS rev commits have easy access to the associated pull requests, but all are better than the current state :)