fix(CONTP-2001): stop asserting the Operator image tag in baseline tests (datadog chart)

[nlchung]

What this PR does / why we need it:

Same problem as #2897, but in the datadog chart's baseline test — which embeds datadog-operator as a subchart, so it wasn't covered by that fix. Test_baseline_inputs compares every rendered resource untyped (raw map[string]interface{}), and the Operator's own version (image tag, plus the app.kubernetes.io/version label sourced from Chart.AppVersion) shows up on multiple resource kinds the subchart renders — not just the Deployment — so every Operator release broke this baseline too, for no real reason.

• Strip the image tag and app.kubernetes.io/version label before comparing actual vs. baseline, via stripOperatorReleaseVersion in verifyUntypedResources, reusing the existing utils.ImageRepository helper from fix(CONTP-2001): stop asserting the Operator image tag in baseline tests (operator chart) #2897.
• Scope the label strip to any resource labeled app.kubernetes.io/name: operator (Deployment, ServiceAccount, ClusterRole, etc.), not just the Deployment — the untyped comparison walks every kind the subchart renders, so a Deployment-only strip (as in fix(CONTP-2001): stop asserting the Operator image tag in baseline tests (operator chart) #2897's typed test) leaves the other kinds still asserting on a version that changes every release.
• Remove the now-unneeded make update-test-baselines-datadog-agent step from phase_datadog in scripts/release-operator.sh — the release worker no longer needs to regenerate these baselines on every Operator bump.

Verified: bumped the embedded datadog-operator subchart's appVersion to a throwaway value locally and confirmed Test_baseline_inputs passes with no baseline changes needed across all 51 scenarios; separately confirmed a real structural change (unrelated to version) still fails the same test, so the fix only suppresses version noise, not genuine drift.

Which issue this PR fixes

CONTP-2001

Special notes for your reviewer:

Stacked on #2897 — no chart behavior changes, this only touches test assertions and the release script. This PR targets nicole.chung/contp-2001 (not main), so #2897 needs to merge first; this PR's base will then need to be retargeted to main before it can merge.

Checklist

• All commits are signed and show as "Verified" on GitHub (see: signing commits)
• For datadog or datadog-operator chart or value changes, update the test baselines (run: make update-test-baselines)

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T14:37:55.468120Z	f8a46fb	Draft marked ready

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