✨ OPRUN-4514: Address comments on 'Move Single Own Namespace back to alpha'

[tmshort]

Addresses comments made on #2568 (which merged wicked fast)

Description

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[Copilot]

Pull request overview

Updates demo scripts and documentation to reflect the current “standard vs experimental” manifest split and clarifies when the SingleOwnNamespaceInstallSupport feature-gate is required for webhook-enabled extensions.

Changes:

• Demo cleanup now restores the standard feature set by applying manifests/standard.yaml instead of patching the operator-controller Deployment and applying a non-existent base.yaml.
• Tutorials clarify that webhook-enabled extensions targeting SingleNamespace/OwnNamespace require the SingleOwnNamespaceInstallSupport feature-gate.
• Draft how-to note clarifies the feature is alpha and disabled by default.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
hack/demo/single-namespace-demo-script.sh	Simplifies cleanup by re-applying standard manifests to reset CRDs/deployments.
hack/demo/own-namespace-demo-script.sh	Same cleanup reset approach using manifests/standard.yaml.
docs/tutorials/explore-available-content.md	Clarifies feature-gate requirement for webhook installs targeting a single namespace.
docs/draft/tutorials/explore-available-content-metas-endpoint.md	Same clarification for the metas endpoint tutorial draft.
docs/draft/howto/single-ownnamespace-install.md	Improves wording about alpha status and default-disabled feature gate.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.61%. Comparing base (e7a9611) to head (77e4860).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2569   +/-   ##
=======================================
  Coverage   68.61%   68.61%           
=======================================
  Files         131      131           
  Lines        9333     9333           
=======================================
  Hits         6404     6404           
  Misses       2438     2438           
  Partials      491      491           

Flag	Coverage Δ
e2e	39.30% <ø> (+0.17%)	⬆️
experimental-e2e	51.62% <ø> (ø)
unit	53.84% <ø> (ø)

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn

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Needs approval from an approver in each of these files:

• docs/OWNERS [grokspawn]
• hack/OWNERS [grokspawn]

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