Auto-activate ruby easy wins for feature-flagging-and-experimentation-sdk

[dd-octo-sts]

Automated activation of easy-win tests for ruby owned by feature-flagging-and-experimentation-sdk
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[github-actions]

CODEOWNERS have been resolved as:

manifests/ruby.yml                                                      @DataDog/ruby-guild @DataDog/asm-ruby

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep subject-limit tests disabled until they assert enrichment

With this file-level activation, Test_Span_Enrichment_Max_Subjects is now enabled for Ruby because it is the only subject-enrichment class not listed below as missing_feature. I checked tests/parametric/test_ffe/test_span_enrichment.py: test_max_10_subjects_enforced only validates the limit inside if "ffe_subjects_enc" in meta, so Ruby can emit no ffe_subjects_enc at all and still pass, while the adjacent subject-enrichment classes remain marked unsupported. This makes the easy-win activation report subject enrichment support even when the tracer does not provide it; either keep this class disabled too or make the test fail when the tag is absent.

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