test: merge overlapping TLS and OIDC rekt e2e suites

[VedantMadane]

Fixes #7638

Proposed Changes

• 🧹 Merge rekt e2e pairs that already share eventshub.WithTLS into single TLSAndOIDC tests with TLS / OIDC subtests
• Keep OIDC-only audience/compliance tests (SupportsOIDC) separate, matching the issue hint
• Resources covered in this PR: Parallel, PingSource, Sequence, ContainerSource, IntegrationSource (timer), JobSink

Why this shape

For these suites the TLS and OIDC event-send paths already use the same TLS-enabled eventshub environment; the OIDC path mainly adds an audience. Running them under one environment setup avoids redundant setup without changing feature coverage.

Left alone on purpose:

• Test*SupportsOIDC (audience of input channel / compliance)
• Broker/Channel TLS rotate + SupportsOIDC style suites where the overlap is not a clear shared event path (can be follow-ups)

Pre-review Checklist

• At least 80% unit test coverage (n/a — rekt e2e organization only)
• E2E tests reorganized; no new production behavior
• Docs PR (n/a — no user-facing impact)
• Spec PR (n/a)
• Conformance test (n/a)

Release Note

NONE

Docs

n/a

[knative-prow]

Welcome @VedantMadane! It looks like this is your first PR to knative/eventing 🎉

[knative-prow]

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[knative-prow]

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