[project][ENG-7225] share cleanup 2025 (milestone 1: simplify)

[aaxelb]

consists of:

• [gizmob] share clean(up)grade [ENG-7388][ENG-7389][ENG-7390] #847
• [chore] update github actions workflow #848
• [ENG-7391] Cleanup, remove sharectl and share.bin.* #849
• [ENG-7455] easy bulk-delete long-past harvest #855

(note: subset of #850 that can be released sooner)

summary of changes

• add management commands
  • shtrove_indexer_run (replaces sharectl search daemon)
  • shtrove_search_setup (replaces sharectl search setup)
  • shtrove_search_teardown (replaces sharectl search purge)
  • delete_pretrove_data (for letting go of some past)
• delete (some) sharev2 api
  • /api/v2/formattedmetadatarecords/...
  • /api/v2/normalizeddata/...
    • note: sharev2 “push” is a POST to this endpoint -- replaced by /trove/ingest
  • /api/v2/sourceregistrations/...
  • /api/v2/schemas/...
  • /api/v1/share/data
• delete sharev2 ingestion pipeline
  • share/harvest/*
  • share/harvesters/*
  • share/metadata_formats/*
  • share/regulate/*
  • share/schema/*
  • share/sources/*
  • share/tasks/*
    • except schedule_index_backfill -- moved to share.models.index_backfill for now
  • share/transform/*
  • share/transformers/*
  • anything deactivated by the ignore_sharev2_ingest feature flag
• delete (some) sharev2 db models/tables from share/models/...
  • core.py: NormalizedData, FormattedMetadataRecord
  • jobs.py: HarvestJob
  • registration.py: ProviderRegistration
  • sources.py: SourceStat
• remove special ember-share handling (for local dev)
• remove all dead code and requirements easily removed