Better UX for choosing between diff strategies

[mrubens]

Context

As a quick follow to #1234, this adds a dropdown to settings to choose your diff strategy.

Implementation

This reuses the experimental booleans, so a little hacky. I think probably best for now, and if this multi-diff works well maybe we just go to it for everyone and remove the option.

Screenshots

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Important

Adds a dropdown in AdvancedSettings.tsx for selecting diff strategies and updates ExperimentalSettings.tsx to exclude certain experiments.

• Behavior:
  • Adds a dropdown in AdvancedSettings.tsx for selecting diff strategies: standard, unified, and multiBlock.
  • Resets experimental strategies when diffs are disabled.
• Experimental Settings:
  • Updates ExperimentalSettings.tsx to exclude DIFF_STRATEGY and MULTI_SEARCH_AND_REPLACE from the experimental features list.
• Misc:
  • Removes ExperimentalFeature related to DIFF_STRATEGY in AdvancedSettings.tsx.

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[mrubens]

cc: @qdaxb @KJ7LNW