Merge the Report._files/_chunks

[Swatinem]

Instead of maintaining two separate fields, this merges the previous _files which was a dict from filename to totals, and the _chunks which was a list of split chunks, themselves optionally a fully parsed ReportFile.

Maintaining only a single structure for the list of files makes a ton of internals of the Report simpler.
It also solves the problem of file_totals getting out of sync with the ReportFile.totals.

Instead of maintaining a FileSummary dataclass, and a separate ReportFile, this merges these two structures together, and makes sure that a Report always has ReportFiles.

Though the new ReportFile has a bit more logic around making parsing of its actual chunk contents on-demand only when needed, and avoid having to parse things when not strictly necessary.

---

I think the ~40% perf regression is reasonable, as it is doing more work now for a "shallow" parse. The slowness comes from the ReportFile constructor being slow. Part of that is because it has to support various arguments and argument types which are primarily only used within tests. In real usage, we either parse ReportFiles from json/chunks, or start with an empty file that has lines added/replaced into it.

[overwatch-beta]

✅ Sentry found no issues in your recent changes ✅

[codspeed-hq]

CodSpeed Performance Report

Merging #553 will degrade performances by 41.83%

_{Comparing swatinem/one-file (b1c9a14) with main (e30c1c7)}

Summary

⚡ 1 improvements
❌ 2 regressions
✅ 6 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_parse_shallow	7.2 ms	12.3 ms	-41.83%
⚡	test_report_carryforward	6.1 ms	2.9 ms	×2.1
❌	test_report_serialize	6 ms	7.1 ms	-15.04%

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 5 lines in your changes missing coverage. Please review.

Project coverage is 88.64%. Comparing base (e30c1c7) to head (b1c9a14).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
shared/reports/resources.py	93.33%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #553      +/-   ##
==========================================
- Coverage   88.69%   88.64%   -0.06%     
==========================================
  Files         462      462              
  Lines       13159    13092      -67     
  Branches     1507     1492      -15     
==========================================
- Hits        11672    11605      -67     
- Misses       1173     1176       +3     
+ Partials      314      311       -3     

Flag	Coverage Δ
shared-docker-uploader	88.64% <96.15%> (-0.06%)	⬇️

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[codecov-notifications]

Codecov Report

Attention: Patch coverage is 96.12403% with 5 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
shared/reports/resources.py	93.42%	1 Missing and 4 partials ⚠️

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[giovanni-guidini]

Very good change!

[sentry-autofix]

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