[Fix] Address TsFile scan parser Sonar issues

[Caideyipi]

Description

This is a Sonar follow-up to #18305 and #18350. Sonar reported two brain-method warnings in the TsFile scan parser.

The affected methods are the parser hot paths for:

• aligned/scalar value-type dispatch;
• TsFile marker transitions and chunk-reader state.

This PR documents and narrowly suppresses those two warnings. Splitting either method would spread state-machine context across extra calls; parser behavior is unchanged.

Verification

• TsFileInsertionEventParserTest: 21 run, 0 failures, 0 errors, 3 existing conditional skips
• DataNode compilation: passed
• Checkstyle: 0 violations
• Spotless and git diff --check: passed

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This PR has:

• been self-reviewed.
• added comments explaining the targeted Sonar suppressions.
• been covered by the existing parser unit tests.