This PR is to add comments to TestSyncMetadata in pkg/ddc/alluxio/metadata_test.go

[Bright0313]

Ⅰ. Describe what this PR does
This PR adds detailed comments to the TestSyncMetadata function to improve code documentation and maintainability.

Ⅱ. Does this pull request fix one issue?
fixes #5047

[fluid-e2e-bot]

Hi @Bright0313. Thanks for your PR.

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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

[TrafalgarZZZ]

/lgtm

[fluid-e2e-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: TrafalgarZZZ

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