@remotion/bundler: Add plugin to suppress PackFileCacheStrategy warnings

[Copilot]

Fixes #5340

This PR implements a Webpack plugin to suppress the frequent warnings about serializing large strings in the cache that were reported in the issue:

<w> [webpack.cache.PackFileCacheStrategy] Serializing big strings (917kiB) impacts deserialization performance (consider using Buffer instead and decode when needed)

Changes Made

• New Plugin: Created IgnorePackFileCacheWarningsPlugin in packages/bundler/src/ignore-packfilecache-warnings.ts

  • Filters out warnings containing [webpack.cache.PackFileCacheStrategy] Serializing big strings
  • Only suppresses warnings, not errors
  • Uses standard Webpack plugin hooks (afterCompile and afterEmit)

• Integration: Added the plugin to both development and production configurations in webpack-config.ts

• Testing: Added comprehensive unit tests to verify the plugin correctly filters target warnings while preserving other warnings

Implementation Details

The plugin follows the same pattern as existing warning suppression plugins in the codebase (AllowOptionalDependenciesPlugin, AllowDependencyExpressionPlugin). It:

1. Implements a filter() method that returns false for warnings containing the target text pattern
2. Hooks into Webpack's compilation lifecycle to filter warnings from compilation.warnings
3. Only affects the specific cache serialization warnings, leaving all other warnings and errors intact

Verification

• ✅ All existing tests pass
• ✅ New unit tests verify correct filtering behavior
• ✅ Linting and formatting checks pass
• ✅ Build completes successfully
• ✅ Minimal changes (only 3 lines modified in webpack-config.ts)

This addresses the noise from frequent cache warnings without masking other important diagnostic information, as requested in the issue.

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Name	Status	Preview	Comments	Updated (UTC)
bugs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2025 9:05am
remotion	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2025 9:05am