config: config_format: address wrongly specified parameter on service section

[cosmo0920]

• Unknown [SERVICE] properties now warn while preserving success behavior.
• Unknown configuration sections now warn and are ignored.
• Section names require exact case-insensitive matches, so [SERVIC] is correctly rejected.
• Added classic/YAML and compatibility regression tests in config_service.c.

Verification:

• ctest --test-dir build -R '^flb-it-config_(service|format|format_fluentbit|format_yaml)$' --output-on-failure
  • 4/4 passed.
• Classic, YAML, and [SERVIC] executable --dry-run checks succeeded with the expected warnings.
• Memory checker: not run; Valgrind and macOS Leaks are unavailable on Windows.
• Working tree is clean.

Closes #8819

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Testing
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• Example configuration file for the change
• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• Run local packaging test showing all targets (including any new ones) build.
• Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature

Backporting

• Backport to latest stable release.

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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.

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