[BP-1.16][FLINK-30878][runtime] Revert "[FLINK-30474][runtime] Propagates leader information change only if the leadership is still acquired"

[XComp]

This reverts commit edaa148. The correlated PR on master is #21830.

What is the purpose of the change

See FLINK-30878 for analysis. PR #21819 caused this.

Brief change log

Reverting the FLINK-30474 change.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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: yes
• 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

[flinkbot]

CI report:

• d2c674c UNKNOWN

Bot commands

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• @flinkbot run azure re-run the last Azure build

[XComp]

The correlated master PR #21830 is approved. I'm not going to wait for the CI to be green because it's a plain git revert without conflicts and it's stabilizing release-1.16 again.