[Bug] Key-only deletes silently disabled on Flink versions without a patch component

[thswlsqls]

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Paimon version
master @ b15bda5

Compute Engine
Flink 2.x (paimon-flink2-common)

Minimal reproduce step

1. Run a Flink cluster built from a release branch or master. The ASF snapshot repository publishes flink-runtime as 2.1-SNAPSHOT / 2.2-SNAPSHOT, so EnvironmentInformation.getVersion() has no patch component.
2. Write to a primary-key table with sink.key-only-deletes.enabled = true.
3. ChangelogModeUtils.isFlink21OrAbove() (paimon-flink2-common/.../flink/utils/ChangelogModeUtils.java line 42) splits on . only, so the minor part is 2-SNAPSHOT, Integer.parseInt throws, catch (RuntimeException) swallows it, and it returns false.

What doesn't meet your expectations?
Expected: key-only deletes are enabled, since this runtime does provide the FLIP-510 ChangelogMode.Builder#keyOnlyDeletes API. Actual: ChangelogNormalize stays in the plan and the log shows the self-contradicting warning requires Flink 2.1+ (current version: 2.2-SNAPSHOT).

Anything else?
Only versions without a patch component break. 2.1.0 and 2.1.0-amzn-0 already parse correctly.

Are you willing to submit a PR?

• I'm willing to submit a PR!