Remove more unused Report code, change serde code to use str

[Swatinem]

I removed the users of the to_archive/to_database functions, so lets remove those, along with other functions.

Another change is to change the serde code to use str. As strange as it might sound, but I believe that python is optimizing strings a bit better, and avoids copying all the string contents around in some cases.

This also cleans up the tests a bit.

[seer-by-sentry]

✅ Sentry found no issues in your recent changes ✅

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.88%. Comparing base (d84177b) to head (a51554c).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
shared/reports/resources.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
- Coverage   88.88%   88.88%   -0.01%     
==========================================
  Files         457      457              
  Lines       12867    12840      -27     
  Branches     1469     1467       -2     
==========================================
- Hits        11437    11413      -24     
+ Misses       1126     1123       -3     
  Partials      304      304              

Flag	Coverage Δ
shared-docker-uploader	88.88% <95.23%> (+0.13%)	⬆️

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[codecov-notifications]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
shared/reports/resources.py	88.88%	1 Missing ⚠️

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[codspeed-hq]

CodSpeed Performance Report

Merging #575 will improve performances by 24.67%

_{Comparing swatinem/report-clean-serde (a51554c) with main (d84177b)}

Summary

⚡ 2 improvements
✅ 7 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_parse_shallow	12.4 ms	9.9 ms	+24.67%
⚡	test_report_serialize	7.1 ms	5.9 ms	+19.76%

[Swatinem]

This fixes most of the regressions from #553 (comment) it would seem.