Another batch of insight fixes

[trevor-e]

• Fixes bug where Watch/AppExtension binaries weren't considered for the export metadata insight
• Fixes the duplicate files insight to group the results by file, previously everything was flat. Also fixes some edge cases where it would report duplicates within nested folders.
  • Added special grouping for .bundle folders and allowlisted .xcprivacy files
• Introduces a new FileSavingsResult to share amongst insights which is more slimmed down and should make the response JSON smaller.

[codecov]

Codecov Report

Attention: Patch coverage is 89.91935% with 50 lines in your changes missing coverage. Please review.

Project coverage is 76.05%. Comparing base (3f0cb9b) to head (cd4c23d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/launchpad/size/utils/file_analysis.py	83.19%	17 Missing and 3 partials ⚠️
src/launchpad/artifacts/apple/zipped_xcarchive.py	5.55%	16 Missing and 1 partial ⚠️
.../launchpad/size/insights/common/duplicate_files.py	83.58%	5 Missing and 6 partials ⚠️
src/launchpad/size/models/common.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   75.78%   76.05%   +0.27%     
==========================================
  Files         127      129       +2     
  Lines        9961    10204     +243     
  Branches     1124     1147      +23     
==========================================
+ Hits         7549     7761     +212     
- Misses       2010     2037      +27     
- Partials      402      406       +4     

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