Check for domainsList only for cloud

[vermakhushboo]

What does this PR do?

Check domainsList for cloud only

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Summary by CodeRabbit

• Bug Fixes
  • Domain verification now correctly differentiates Cloud and self‑hosted environments, avoiding unintended domain creation/update attempts outside Cloud.
  • Consistent behavior applied across Functions, Project Settings, and Sites domain verification pages.
  • Preserves existing success messaging and navigation while preventing misleading flows in non‑Cloud contexts.