[hotfix][ci] Exclude PR author's own reviews from community review labeling

[spuru9]

What is the purpose of the change

The community review GitHub Action (community-review.sh) applies the community-reviewed label when a non-committer reviews a PR. However, it also counts the PR author's own reviews — for example, a self-comment on their own PR — as a community review. As a result, a PR can be incorrectly labeled community-reviewed purely because its author commented on it, without any actual community review having taken place.

This change excludes the PR author from the community-review tally so that only reviews from other community members are counted.

Brief change log

• Fetch the PR author.login in the open-PRs GraphQL query
• Pass the PR author login into process_pr_reviews
• Skip reviews authored by the PR author when counting community reviews / approvals

Verifying this change

This change is a trivial rework of the community-review labeling script with no production code impact.

Verified locally by running the script's functions with network calls mocked:

• A PR whose only review is by its own author → no community-reviewed label applied (previously the label was incorrectly applied).
• A PR that also has a review from another community member → community-reviewed label applied as before.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

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Was generative AI tooling used to co-author this PR?

• Yes (Claude Code)

Generated-by: Claude Code

[flinkbot]

CI report:

• c78d363 Azure: SUCCESS

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