Remove GraphQL AppSec contrib from Steep ignored files

[y9v]

What does this PR do?
GraphQL contrib was in the list of files that Steep ignores. This PR removes those files from the ignore list, and fixes type errors.

Motivation:
We don't want any AppSec files to be ignored by Steep.

Change log entry
None.

Additional Notes:
APPSEC-60626

How to test the change?
CI

[github-actions]

Typing analysis

Ignored files

This PR clears 5 ignored files. It increases the percentage of typed files from 42.98% to 43.54% (+0.56%).

Ignored files (+0-5)

✅ Cleared:

lib/datadog/appsec/contrib/graphql/appsec_trace.rb
lib/datadog/appsec/contrib/graphql/gateway/multiplex.rb
lib/datadog/appsec/contrib/graphql/gateway/watcher.rb
lib/datadog/appsec/contrib/graphql/integration.rb
lib/datadog/appsec/contrib/graphql/patcher.rb

[pr-commenter]

Benchmarks

Benchmark execution time: 2026-02-12 17:37:16

Comparing candidate commit 3c7a780 in PR branch appsec-daily-rbs-chore-12-feb with baseline commit c2bfb0b in branch master.

Found 1 performance improvements and 1 performance regressions! Performance is the same for 42 metrics, 2 unstable metrics.

scenario:error - error tracking, with_error=true - all

• 🟥 throughput [-401.423op/s; -378.576op/s] or [-5.654%; -5.332%]

scenario:tracing - Propagation - Trace Context

• 🟩 throughput [+3255.751op/s; +3353.148op/s] or [+9.540%; +9.825%]

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 95.10% (+0.00%)

_{This comment will be updated automatically if new data arrives.
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