fix(composite datasource): improve perf on collection exist check

[arnaud-moncel]

Definition of Done

General

• Write an explicit title for the Pull Request, following Conventional Commits specification
• Test manually the implemented changes
• Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• Consider the security impact of the changes made

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Files with Diff Coverage (2)

Rating	File	% Diff	Uncovered Line #s
	...lib/forest_admin_datasource_customizer/composite_datasource.rb	100.0%
	...rs/rename_collection/rename_collection_datasource_decorator.rb	100.0%
	Total	100.0%

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• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

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[forest-bot]

🎉 This PR is included in version 1.19.1 🎉

The release is available on GitHub release

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