chore(dotnet): temporarily skip capability completeness during FFE rollout

[pavlokhrebto]

Motivation

dd-trace-dotnet starts advertising FFE_FLAG_CONFIGURATION_RULES (capability 46) in 3.54.0, from DataDog/dd-trace-dotnet#9044.

test_default_capability_completeness enforces strict equality for non-prerelease versions, and dotnet snapshot builds report a clean version, so:

• the tracer PR fails with seen_but_not_expected_capabilities={<Capabilities.FFE_FLAG_CONFIGURATION_RULES: 46>};
• adding the registry entry first is not an option either, because it then fails with expected_but_not_seen_capabilities until the tracer ships.

Changes

Declares test_default_capability_completeness as missing_feature for dotnet, so the tracer PR can merge with a green system_tests check. #7612 removes this declaration in the same PR that declares the capability at >=3.54.0, restoring strict checking.

Merge order:

1. this PR;
2. DataDog/dd-trace-dotnet#9044;
3. #7612 — declares >=3.54.0 and removes the declaration added here.

Decisions

Skipping one test for one language is preferred to merging the tracer PR with a red system_tests check.

The pair is already verified: with [dotnet@pavlo.khrebto/EX-2703/ffe-module-wiring] in the title, System Tests (dotnet, dev) / parametric passed on run 34122374529, which ran the suite against a branch image of the tracer PR.

Verification

• ./format.sh — no changes
• ./run.sh TEST_THE_TEST tests/test_the_test/test_capabilities.py — passed

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

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Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

manifests/dotnet.yml                                                    @DataDog/system-tests-reviewers