Remove replay-web feature flag

[slifty]

This PR removes reference to the replay-web feature flag now that it's deployed and enabled across all environments.

Resolves #1120

[Copilot]

Pull request overview

This PR removes the replay-web feature-flag gating from the file viewer now that ReplayWeb is fully enabled in all environments, and updates the associated unit tests to reflect the always-on behavior for web archive records.

Changes:

• Removed FeatureFlagService injection and replay-web flag checks from FileViewerComponent.
• Always computes replayUrl via getReplayUrl(), which already returns null for non–web archive records.
• Updated component tests to stop mocking feature flags and to validate replayUrl behavior based on record type.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/app/file-browser/components/file-viewer/file-viewer.component.ts	Removes replay-web feature-flag dependency and sets replayUrl unconditionally (still type-gated inside getReplayUrl()).
src/app/file-browser/components/file-viewer/file-viewer.component.spec.ts	Removes feature-flag mocking and updates replay URL tests to align with the new always-on behavior for web archives.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.15%. Comparing base (6103d93) to head (dd085b9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1121      +/-   ##
==========================================
- Coverage   52.33%   52.15%   -0.19%     
==========================================
  Files         354      354              
  Lines       12093    12091       -2     
  Branches     2186     2185       -1     
==========================================
- Hits         6329     6306      -23     
- Misses       5538     5559      +21     
  Partials      226      226              

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[aasandei-vsp]

Looks straight forward, LGTM.