feat(format-po-gettext): respect Plural-Forms header

[garikkh]

Description

Certain TMS might provide a different Plural-Forms header with gettext-style PO files. Instead of depending on using either CLDR or gettext defined plurals, change the gettext formatter to consider the header.

See related PR: #2010

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Examples update

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)

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[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	2.88 KB (0%)
./packages/detect-locale/dist/index.mjs	723 B (0%)
./packages/react/dist/index.mjs	1.68 KB (0%)
./packages/remote-loader/dist/index.mjs	7.26 KB (0%)

[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 8 lines in your changes missing coverage. Please review.

Project coverage is 75.84%. Comparing base (d6b9698) to head (f0a676b).
Report is 73 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/format-po-gettext/src/po-gettext.ts	76.00%	5 Missing and 1 partial ⚠️
packages/format-po-gettext/src/plural-samples.ts	94.28%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2070      +/-   ##
==========================================
- Coverage   76.65%   75.84%   -0.81%     
==========================================
  Files          81       89       +8     
  Lines        2090     2227     +137     
  Branches      533      560      +27     
==========================================
+ Hits         1602     1689      +87     
- Misses        375      425      +50     
  Partials      113      113              

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[andrii-bodnar]

@garikkh thank you!