refactor: remove support for Drill

[jeskepetr]

Summary

Removes DRILL from the data source type enums. Drill is being removed from the backend
(gdc-nas #25522), so the SDK no longer needs to model it. Mirrors the Greenplum removal in
#1723.

Unlike Greenplum there was never a hand-written CatalogDataSourceDrill class, so there is
nothing to drop from the gooddata_sdk exports, and no test or docs example to remove — this
change is narrower than #1723 by exactly those pieces.

• drop the DRILL enum entry from the two source schemas it originates from,
  gooddata-metadata-client.json (5) and gooddata-scan-client.json (1), and from the merged
  gooddata-api-client.json (6)
• drop it from the six generated models that mirror them — one line each, exactly the shape
  regeneration produces (the same 6/5/1 shape refactor: remove support for Greenplum #1723 produced)
• reword two prose mentions of Drill as a multi-schema data source manager to Dremio only

Test Plan

• all three schemas still parse as JSON; all six generated models still compile
• pre-commit passed (ruff, ruff format, copyright, trailing whitespace, EOF)
• ENABLE_DRILL_TO_URL_BY_DEFAULT is a drill-to-URL setting, unrelated to Apache Drill —
  left untouched, still 25 occurrences

The merged schemas/gooddata-api-client.json was edited line-wise rather than rebuilt through
the Makefile's jq -S -s step: jq 1.6 does not preserve number literals and rewrites unrelated
values (2.6E+9 → 2600000000, 1.0 → 1) across the file, while the checked-in copy was
produced with jq 1.7+. Same approach as #1723.

Risk

low — removes one value from generated enums plus schema definitions. No hand-written class
or export changes, so unlike #1723 there is no import-time breakage for anyone.

JIRA: https://gooddata.atlassian.net/browse/F1-2434

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📥 Commits

Reviewing files that changed from the base of the PR and between a1ccba8 and 504b44d.

📒 Files selected for processing (11)

• docs/content/en/latest/data/data-source/scan_schemata.md
• gooddata-api-client/gooddata_api_client/model/declarative_data_source.py
• gooddata-api-client/gooddata_api_client/model/json_api_data_source_identifier_out_attributes.py
• gooddata-api-client/gooddata_api_client/model/json_api_data_source_in_attributes.py
• gooddata-api-client/gooddata_api_client/model/json_api_data_source_out_attributes.py
• gooddata-api-client/gooddata_api_client/model/json_api_data_source_patch_attributes.py
• gooddata-api-client/gooddata_api_client/model/test_definition_request.py
• packages/gooddata-sdk/src/gooddata_sdk/catalog/data_source/service.py
• schemas/gooddata-api-client.json
• schemas/gooddata-metadata-client.json
• schemas/gooddata-scan-client.json

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.15%. Comparing base (a1ccba8) to head (504b44d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1729   +/-   ##
=======================================
  Coverage   79.15%   79.15%           
=======================================
  Files         271      271           
  Lines       18794    18794           
=======================================
  Hits        14876    14876           
  Misses       3918     3918           

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