fix(validation): convert ASK queries to SELECT for both CM and imported

[schivmeister]

Imported SPARQL test files failed validation because the importer only set content (raw file), not query (validation query).

• Add convert_ask_to_select() to sparql_test_suite/services/data.py
• Guard against converting queries that already start with SELECT
• Use shared converter in importer for imported SPARQL files
• Use shared converter in CM assertions (replaces duplicate template calls)
• Add unit tests for ASK->SELECT conversion edge cases

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.71%. Comparing base (c4048a1) to head (d47b391).
⚠️ Report is 16 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../backend/package_importer/adapters/importer_abc.py	50.00%	1 Missing ⚠️
...package_validator/services/sparql_cm_assertions.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #442      +/-   ##
===========================================
+ Coverage    55.63%   55.71%   +0.07%     
===========================================
  Files          200      200              
  Lines         8309     8333      +24     
===========================================
+ Hits          4623     4643      +20     
- Misses        3686     3690       +4     

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[schivmeister]

For the record, this has not worked to solve custom SPARQL validation. The queries are not run. Something else must be afoot.