feat: construct and index Spanish Algolia objects for skills, jobs and industries

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JIRA: https://2u-internal.atlassian.net/browse/ENT-11386

Re-raises and rebases #286 onto the latest master.

Summary

Implements Spanish (and extensible multi-language) localization for the Algolia jobs index. For each enabled locale in TAXONOMY_TRANSLATION_LOCALES, a duplicate set of Algolia records is created with translated names and descriptions from the existing TaxonomyTranslation model. All records (English + localized) are indexed in a single atomic operation with zero downtime.

Key Changes

taxonomy/algolia/utils.py

• build_name_translation_maps(language_code) — builds {English name → Translated name} dicts for jobs/skills/industries using one DB query per locale (O(1) lookup during translation)
• translate_skill_dict, translate_industries_array, translate_job_record — translation helpers that preserve schema and fall back to English when no translation exists
• create_localized_job_records — orchestrates building translation maps and producing localized job variants
• index_jobs_data_in_algolia — loops over TAXONOMY_TRANSLATION_LOCALES, appends localized batches before the atomic Algolia write
• fetch_jobs_data — stamps each English record with metadata_language: 'en'

taxonomy/algolia/constants.py

• metadata_language added to Algolia searchable attributes and customRanking
• TAXONOMY_TRANSLATION_LOCALES = ['es'] — add more ISO codes to enable additional languages, zero code changes needed

taxonomy/tests/test_algolia_translations.py (new, 519 lines)

• 22 tests covering all new functions; all pass ✅

Version

• 2.4.0 → 3.0.0

Merge Checklist

• No new migrations required (uses existing TaxonomyTranslation model)
• Version bumped (3.0.0)
• Changelog updated
• All 22 tests pass
• Rebased on latest upstream/master (68c3f24)
• Graceful fallback to English when translation is missing

Post Merge

• Tag pushed and new version released
• Verify 3.0.0 on PyPI
• PR created in course-discovery to upgrade taxonomy-connector dependency