tests: runtime: Use long json payloads to trigger rotataion easily

[cosmo0920]

Using small json payloads could be difficult to trigger file rotation.
So, we need to use long json payloads instead.

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Testing
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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Tests
  • Expanded file-rotation test coverage by using larger input payloads.
  • Improved validation of same-second rotations, filename patterns, legacy cleanup, gzip compression, and maximum-file cleanup.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6f416e10-5d81-4c54-a820-53ad91ae38ab

📥 Commits

Reviewing files that changed from the base of the PR and between cbe1253 and e80c10c.

📒 Files selected for processing (1)

• tests/runtime/out_file_rotation.c

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📝 Walkthrough

Walkthrough

Five file-rotation tests now use JSON_LONG instead of JSON_SMALL. The tests cover same-second rotation, filename patterns, legacy cleanup, gzip compression, and maximum-file cleanup.

Changes

File rotation payload coverage

Layer / File(s)	Summary
Update rotation test payloads tests/runtime/out_file_rotation.c	The five file-rotation tests now send JSON_LONG payloads.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: edsiper, sagiroosto

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: using longer JSON payloads to make runtime file-rotation tests trigger more easily.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cosmo0920-plug-failing-rotate-test-case-2nd-attempt

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