Enable SwiftLint rule: contains_over_filter_count

[mokagio]

Summary

Enables SwiftLint's contains_over_filter_count rule.

The rule prefers xs.contains { ... } over xs.filter { ... }.count > 0 (and the == 0 / != 0 variants), which is a performance and clarity win.

• 0 violations in the current codebase, so no code changes — only the rule entry in .swiftlint.yml.
• The rule will catch new occurrences in future code.

Part of the Orchard SwiftLint rollout campaign.

Test plan

• CI build is green.
• swiftlint lint --strict --no-cache is clean against the rule.

🤖 Generated with Claude Code

[dangermattic]

	1 Message
📖	This PR is still a Draft: some checks will be skipped.

Generated by 🚫 Danger

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	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	32098
	Version	PR #25522
	Bundle ID	org.wordpress.alpha
	Commit	ae6007f
	Installation URL	7j19bua29v1p0

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📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	32098
	Version	PR #25522
	Bundle ID	com.jetpack.alpha
	Commit	ae6007f
	Installation URL	7ueh2cu4nh0oo

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[mokagio]

Superseded by #25536, which bundles this rule with the other zero-violation enables for review in a single PR. Closing in favour of that one.

Posted by Claude (Opus 4.7) on behalf of @mokagio with approval.