chore(eol-server): update tests & eol server COMPASS-9909

[mabaasit]

Description

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• If this change updates the UI, screenshots/videos are added and a design review is requested
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[Copilot]

Pull Request Overview

This PR updates test suites and the end-of-life server version configuration to remove server version checks that are no longer needed, likely because support for older MongoDB server versions has been dropped.

• Removes server version checks from multiple e2e test files that were skipping tests for older server versions
• Updates the fallback end-of-life server version from '4.4' to '6.x'
• Updates corresponding test expectations to reflect the new end-of-life version threshold

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/compass-e2e-tests/tests/search-indexes.test.ts	Removes server version check for >= 4.1.11 and unused import
packages/compass-e2e-tests/tests/database-collections-tab.test.ts	Removes server version checks for time series and clustered collections
packages/compass-e2e-tests/tests/collection-indexes-tab.test.ts	Removes server version checks and describe blocks for wildcard and hide/unhide index features
packages/compass-e2e-tests/tests/collection-import.test.ts	Removes server version checks for validation error details and unused import
packages/compass-e2e-tests/tests/collection-documents-tab.test.ts	Removes server version check for validation features and unused import
packages/compass-e2e-tests/tests/collection-aggregations-tab.test.ts	Removes numerous server version checks and consolidates aggregation operator expectations
packages/compass-connections/src/utils/end-of-life-server.ts	Updates fallback end-of-life server version from '4.4' to '6.x'
packages/compass-connections/src/utils/end-of-life-server.spec.ts	Updates test expectations to reflect new end-of-life version threshold

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[kraenhansen]

LGTM (for what it's worth 🙂)