[MAINTENANCE] Update data dump indexing to support v2-only format

[adambuttrick]

Service/repository

• ror-community/ror-api
• ror-community/ror-records (GitHub Actions workflows)

Describe the current state/issue

With the deprecation of schema v1, ROR data dumps now contain only a single JSON file in v2 format. However, the indexing code and associated Github action workflows still expect the old format with two files (v1 and v2).

Old data dump format:

v1.73-2025-10-28-ror-data/
├── v1.73-2025-10-28-ror-data.json
├── v1.73-2025-10-28-ror-data.csv
├── v1.73-2025-10-28-ror-data_schema_v2.json
└── v1.73-2025-10-28-ror-data_schema_v2.csv

New data dump format (v2.0 onwards):

v2.0-2025-12-16-ror-data/
├── v2.0-2025-12-16-ror-data.json 
└── v2.0-2025-12-16-ror-data.csv

The current indexrordump.py uses filename pattern matching to detect schema version:

• Files with schema_v2 in filename are used for the v2 index
• Files without schema_v2 in filename are used v1 index

This logic breaks with v2.0-2025-12-16-ror-data.json, which does not contain schema_v2 in the filename, causing it to be incorrectly treated as the v1 data dump.

Describe the desired state/solution

Complete removal of v1 indexing support from both repositories.

ror-api tasks:

• indexrordump.py#L15-L22: Remove get_nested_names_v1 function
• indexrordump.py#L28-L37: Remove get_nested_ids_v1 function
• indexrordump.py#L139-L152: Update file detection logic
• indexrordump.py#L93-L99: Remove v1 index handling in index_dump() function
• setup.py#L39: Remove schema choice 1 from -s, --schema argument
• setup.py: Update help text to reflect v2-only indexing
• indexror.py#L16-L23: Remove get_nested_names_v1 function
• indexror.py#L29-L38: Remove get_nested_ids_v1 function
• indexror.py#L155-L156: Remove v1 conditional in index() function
• indexror.py#L186-L192: Remove v1 nested field generation in index() function
• settings.py: Assess if INDEX_v1 and INDEX_TEMPLATE_ES7_v1 settings can be removed
• rorapi/v1/: Assess v1 directory contents for removal (index templates, serializers)

ror-records workflow tasks:

• prod_manual_index.yml: Remove v1 from schema-version choices
• prod_manual_index.yml: Remove v1 API URL conditional logic
• staging_manual_index.yml: Remove v1 from schema-version choices
• staging_manual_index.yml: Remove v1 validation schema path
• staging_manual_index.yml: Remove v1 API URL conditional logic
• prod_index_dump.yml: Remove v1 from schema-version choices
• prod_index_dump.yml: Remove v1 API URL conditional logic
• staging_index_dump.yml: Remove v1 from schema-version choices
• staging_index_dump.yml: Remove v1 API URL conditional logic

Testing tasks:

• Test all changes in dev-ror-records environment first
• Verify indexing works with new v2.0 data dump format
• Verify staging workflows function correctly
• Verify production workflows function correctly

[jrhoads]

Ror api updates have been released to production and can be tested with a production workflow

[jrhoads]

The ror-records workflows are updated in this ror-community/ror-records#229
@adambuttrick If that looks good I'm happy to merge