[FLINK-24026][misc] Fix FLIP-XXX link can't be recognized correctly by IDEA

[wuchong]

What is the purpose of the change

In FLINK-24013, we support link for FLINK-XXX to JIRA issue in IDEA git log display. However, the FLIP-XXX is also processed in the same way which leads to a wrong link, e.g. FLIP-33 is linked to https://issues.apache.org/jira/browse/FLIP-33.

Brief change log

Change the issueRegexp to fully match FLINK- FLIP- prefix and direct to different link.

Verifying this change

Verified in my local IDEA.

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

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

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

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Last check on commit 2171e30 (Fri Aug 27 11:02:05 UTC 2021)

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[tillrohrmann]

LGTM. +1 for merging.