Fix false positive i18n warnings for translated glossary term references

[m-aciek]

Purpose

• Translators were incorrectly warned about "inconsistent references" when legitimately translating hyperlink display text while preserving targets.
• Term references (:term:) were generating "inconsistent term references" warnings when translators legitimately translated glossary term names or when PO files wrapped lines mid-reference.

Cases from #14162:

• Case 2: Add translated display text for hyperlink
• Case 3: Translated display text for hyperlink
• Case 4: Use translated hyperlink tag
• Case 5: Translated glossary term (with explicit target syntax)
• Additional: Term references with translated glossary term names
• Additional: Term references with newlines from PO file wrapping

# Examples that incorrectly warned:
msgid ":term:`virtual <abstract base\nclass>`"  # newline from PO wrapping
msgstr ":term:`wirtualną <abstrakcyjna klasa bazowa>`"

msgid ":term:`text encoding`"  # translated glossary term name
msgstr ":term:`kodowanie tekstu`"

Changes

• Modified update_pending_xrefs() to validate cross-reference count only, not content

  • Removed compare_references() call comparing by reftarget
  • Allows translators to translate both display text and term names when glossary is translated
  • Preserves warnings for actual inconsistencies (count mismatches)

• Modified update_refnamed_references() - same pattern applied to term references

• Test coverage for newline handling and translated term names

This unblocks Python documentation translations where glossaries are translated alongside the content.

Note that changes were coded with use of Copilot, I performed a review and tests.

Python docs warnings before and after those changes (build warnings column).

References

• closes i18n: False positive build warnings of hyperlinks and term roles #14162

[m-aciek]

ty failures should be addressed by #14296.