[9.1](backport #45222) Support both take over configurations

[mergify]

Proposed commit message

The take over mode configuration changed format when its functionality was expanded. It changed
from a single boolean

take_over: true

To an object:

take_over:
  enabled: true
  from_ids: ["foo", "bar"]

This commit makes both formats accepted with no change on how the feature works.

Checklist

• 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.

## Disruptive User Impact
## Author's Checklist

How to test this PR locally

Run the tests

cd filebeat

# Unit Tests
go test -run="TestTakeOverCfg|TestGetTakeOver" -count=1 -v ./input/filestream/...

# Integration tests
mage buildSystemTestBinary
go test -tags=integration -run=TestFilestreamTakeOver -v -count=1 ./tests/integration

For manual testing, follow the procedures from #42624 and use both configuration formats.

Related issues

• Closes Update take_over configuration to keep compatibility with the previous version #45221

## Use cases
## Screenshots
## Logs

---

This is an automatic backport of pull request #45222 done by Mergify.

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🔍 Preview links for changed docs

• docs/reference/filebeat/filebeat-input-filestream.md