x-pack/filebeat/input/o365audit: deprecate input

[efd6]

Proposed commit message

See title.

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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Related issues

• Closes [Filebeat] Deprecate o365audit API #37719

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