Add comments to IsPlacementModeSet in pkg/ddc/base/runtime.go.

[Liquor12138]

I. Describe what this PR does
Add comments to IsPlacementModeSet in pkg/ddc/base/runtime.go.

II. Does this pull request fix one issue?
fixes #5924

III. Special notes for reviews

[fluid-e2e-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[fluid-e2e-bot]

Hi @Liquor12138. Thanks for your PR.

I'm waiting for a fluid-cloudnative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gemini-code-assist]

Code Review

This pull request adds a descriptive doc comment to the IsPlacementModeSet method in pkg/ddc/base/runtime.go to explain its purpose and return behavior. There are no review comments, and I have no additional feedback to provide.

[cheyang]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.35%. Comparing base (28b7b87) to head (ddacda6).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5925   +/-   ##
=======================================
  Coverage   63.35%   63.35%           
=======================================
  Files         481      481           
  Lines       33070    33070           
=======================================
  Hits        20953    20953           
  Misses      10442    10442           
  Partials     1675     1675           

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[cheyang]

/lgtm /approve

Automated review for comment-only PR. Diff confirmed: only comments/documentation text changed. DCO ✓, all required checks ✓.

[cheyang]

/lgtm /approve