[Fix][Zeta] Fix losing checkpoint scheduling in extreme cases

[Hisoka-X]

Purpose of this pull request

Fix losing checkpoint scheduling in extreme cases. For example, clock drift.

Does this PR introduce any user-facing change?

no

How was this patch tested?

add new test.

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Copilot]

Pull Request Overview

This pull request fixes an issue with losing checkpoint scheduling in edge cases by refining the checkpoint trigger logic and logging messages.

• Updated logging messages to use parameterized placeholders.
• Introduced an additional check to ensure all tasks are ready before triggering a checkpoint.
• Adjusted the scheduling logic for final checkpoint types.

[jiamin13579]

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