ci: start testing BCR tests with bazel 9

[aignas]

It seems that the CI is passing now with the latest bazel 9 release.
Hence, start testing it in our CI and when submitting new versions to
BCR.

Fix #3392

[gemini-code-assist]

Summary of Changes

Hello @aignas, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the continuous integration configurations to include Bazel 9 in the testing matrix. The primary goal is to expand test coverage to the latest Bazel version, ensuring that both general presubmit checks and Bazel Central Registry (BCR) related tests, including Gazelle-specific ones, are compatible and stable with Bazel 9.

Highlights

• Bazel 9 Support: Added Bazel 9 to the testing matrix in .bazelci/presubmit.yml to ensure general presubmit tests are run against the latest Bazel version.
• BCR Gazelle Tests: Updated .bcr/gazelle/presubmit.yml to include Bazel 9 in the testing matrix for Gazelle-specific Bazel Central Registry (BCR) tests.
• General BCR Tests: Modified .bcr/presubmit.yml to incorporate Bazel 9 into the Bazel version matrix for general Bazel Central Registry (BCR) module tests.

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[gemini-code-assist]

Code Review

This pull request aims to add Bazel 9 to the CI test matrix for BCR tests. The changes are consistently applied across the relevant YAML configuration files (.bazelci/presubmit.yml, .bcr/gazelle/presubmit.yml, and .bcr/presubmit.yml) by adding 9.* to the bazel version list. Additionally, a helpful comment has been added to .bazelci/presubmit.yml to ensure future synchronization between related files. The changes are straightforward and correctly implement the intended expansion of CI testing. I have no further suggestions as the implementation is sound.