[SD-442] move contentCollectionSearchConnector feature flag

[lambry]

Issue: https://digital-vic.atlassian.net/browse/SD-442

What I did

• Moves the contentCollectionSearchConnector feature flag into ripple-tide-landing-page the one place it's used so the default doesn't need to come from individual projects (can still be overridden in individual projects)

Checklist

For all PR's

• I've added relevant changes to the project Readme if needed
• I've updated the documentation site as needed
• I have added tests to cover my changes (if not applicable, please state why in a comment)

For new UI components only

• I have added a storybook story covering all variants
• I have checked a11y tab in storybook passes
• I have added cypress component tests (if the component is interactive)
• Any events are emitted on the event bus using emitRplEvent

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[cypress]

ripple-framework    Run #2335

Run Properties:   Passed #2335  •  80eaa676b0: Merge branch 'release/2.20.0' into bugfix/content-collection-fix

Project	ripple-framework
Branch Review	bugfix/content-collection-fix
Run status	Passed #2335
Run duration	17m 21s
Commit	80eaa676b0: Merge branch 'release/2.20.0' into bugfix/content-collection-fix
Committer	dylankelly
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	211
View all changes introduced in this branch ↗︎