revert(operator): register DGD admission on v1beta1

[sttts]

Summary

• Switch the DGD validating and mutating webhook registrations to the v1beta1 paths and API version for 1.4.
• Keep both v1alpha1 and v1beta1 handlers served by the operator so upgrades and rollbacks involving 1.3 remain safe.
• Add TODO(1.5) markers to remove the legacy v1alpha1 validation and defaulting handlers after 1.3 is no longer a supported upgrade or rollback target.

This is the registration-only follow-up to #11117 and its 1.3 backport #11130.

Validation

• GOCACHE=/private/tmp/dynamo-go-cache go test ./internal/webhook/...
• helm lint .
• helm template dynamo-operator . --namespace dynamo-system --set discoveryBackend=kubernetes
• Verified the rendered validating and mutating webhook paths and apiVersions are v1beta1.

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Summary by CodeRabbit

• Bug Fixes
  • Updated deployment webhooks to use the newer API version, improving compatibility with current cluster validation and mutation requests.
  • Aligned webhook configuration so both validation and mutation flows point to the updated endpoint format.
  • Refreshed related notes to reflect the new upgrade and removal timeline.

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[devin-ai-integration]

Devin Review found 1 potential issue.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 00662195-14b6-474a-b1cf-aa66cdc84619

📥 Commits

Reviewing files that changed from the base of the PR and between d17cdf7 and 61de5c2.

📒 Files selected for processing (3)

• deploy/helm/charts/platform/components/operator/templates/webhook-configuration.yaml
• deploy/operator/internal/webhook/defaulting/dynamographdeployment_handler.go
• deploy/operator/internal/webhook/validation/dynamographdeployment_handler.go

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Walkthrough

This PR migrates the dynamographdeployments webhook configuration from v1alpha1 to v1beta1 endpoints and apiVersions in the Helm chart, and updates inline comments in the defaulting and validation Go handlers with TODO notes for future v1alpha1 code removal.

Changes

Webhook v1beta1 Migration

Layer / File(s)	Summary
Helm webhook configuration v1beta1 update deploy/helm/charts/platform/components/operator/templates/webhook-configuration.yaml	Validating and mutating webhook entries for dynamographdeployments switched from v1alpha1 to v1beta1 endpoint paths and apiVersions; prior transition TODO comments removed.
Handler comment updates for v1alpha1 removal timing deploy/operator/internal/webhook/defaulting/dynamographdeployment_handler.go, deploy/operator/internal/webhook/validation/dynamographdeployment_handler.go	Comments describing v1alpha1 endpoint retention replaced with TODO(1.5) notes specifying removal after 1.3 is no longer an upgrade/rollback target; no functional logic changed.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Related Issues: None specified

Related PRs: None specified

Suggested labels: area/deploy, webhook, documentation

Suggested reviewers: None specified

🥕 A webhook hops from alpha to beta,
Its paths renewed, its TODOs set free,
No logic broke, just names refined,
For version 1.5, the notes aligned.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description omits the required Overview, Details, reviewer start point, and Related Issues sections from the template.	Add the template sections: Overview, Details, Where should reviewer start?, and Related Issues with the required issue linkage or no-issue confirmation.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the main change by describing DGD admission registration on v1beta1.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="[linters_context] typechecking error: pattern ./...: directory prefix . does not contain main module or its selected dependencies"

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_{Comment @coderabbitai help to get the list of available commands.}

[sttts]

/ok to test 61de5c2

[dmitrytokarev]

/ok to test 61de5c2

[sttts]

/ok to test bcbf44b