[FLINK-38727] Fix flaky test by adding slot request timeout configura…

[Shekharrajak]

What is the purpose of the change

Fix flaky test EventTimeWindowCheckpointingITCase.testPreAggregatedSlidingTimeWindow[FORST_INCREMENTAL] which fails with [NoResourceAvailableException] due to premature slot allocation timeout under CI load.

https://issues.apache.org/jira/browse/FLINK-38727

Brief change log

• Added timeout configurations in createClusterConfig() to handle slow TaskManager registration:
  • SLOT_REQUEST_TIMEOUT: 5 minutes
  • STANDALONE_CLUSTER_STARTUP_PERIOD_TIME: 2 minutes
  • REQUIREMENTS_CHECK_DELAY: 30 seconds

Verifying this change

This change is already covered by existing tests:

• Ran EventTimeWindowCheckpointingITCase#testPreAggregatedSlidingTimeWindow - all 6 state backend variants pass (MEM, FILE, ROCKSDB_FULL, ROCKSDB_INCREMENTAL, ROCKSDB_INCREMENTAL_ZK, FORST_INCREMENTAL)

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 (test-only change)
• 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:

• 1d8ff74 Azure: FAILURE

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