Fix sitemap generation

[stevejalim]

Since the refactor to use Django's i18n mechanism in #14256, not our original Prefixer, resolved URLs are automatically prepended with settings.LANGUAGE_CODE, which means the update_sitemaps management command (used by www-sitemap-generator) creates a sitemap.json containing paths prefixed with en-US/, which downstream use of this data for sitemap generation is not expecting.

The simplest fix was to drop that part of the path.

Issue / Bugzilla link

Resolves #14480

Testing

Tricky to test end-to-end, or to write meaningful tests for, but I have extracted three examples of the sitemap.json file, showing that this changeset generates an identical (except for ordering of array elements) version of the data:

• main currently generates this: broken_sitemap.json (36090 lines and en-US prefixing every path)
• The commit immediately to the i18n-refactor merge (b54650a) generates this: original_sitemap.json (15146 lines, with no lang-code prefix on paths)
• The fixed version of the sitemap.json looks like this fixed_sitemap.json (15146 lines and no lang-code prefix on paths)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 76.44%. Comparing base (d82f824) to head (52a63e0).
Report is 1 commits behind head on main.

Files	Patch %	Lines
bedrock/sitemaps/utils.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14481      +/-   ##
==========================================
- Coverage   76.46%   76.44%   -0.02%     
==========================================
  Files         148      148              
  Lines        7975     7977       +2     
==========================================
  Hits         6098     6098              
- Misses       1877     1879       +2     

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[pmac]

🎂