feat(gql): Gate GraphQL data collection behind data_collection option

[ericapisani]

Attach the GraphQL document and variable definitions to error events based on the structured data_collection configuration (graphql.document / graphql.variables), falling back to send_default_pii when data_collection is not set.

Refs PY-2585
Refs #6745

[linear-code]

PY-2585

[github-actions]

Codecov Results 📊

✅ 97865 passed | ⏭️ 6410 skipped | Total: 104275 | Pass Rate: 93.85% | Execution Time: 352m 45s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +433
Passed Tests	📈 +434
Failed Tests	📉 -1
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_circular_references_span_streaming
  • File: tests.tracing.test_misc

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2519 uncovered lines.
❌ Project coverage is 89.69%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/gql.py	100.00%	⚠️ 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.71%    89.69%    -0.02%
==========================================
  Files          193       193         —
  Lines        24392     24437       +45
  Branches      8642      8684       +42
==========================================
+ Hits         21882     21918       +36
- Misses        2510      2519        +9
- Partials      1399      1402        +3

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