[FLINK-40125][ci] Add auto cancel for concurrently run jobs

[snuyanzin]

What is the purpose of the change

The PR adds auto-cancel for concurrently running GHA for the same PR
as another step to mitigate GHA resource usage

Brief change log

GHA

Verifying this change

GHA

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 (please specify the tool below)

[flinkbot]

CI report:

• fec09cd Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[spuru9]

LGTM, very useful to reduce time to merge.

[snuyanzin]

in fact it is not related to time to merge, because ci status on every PR is taken from Azure, not GHA