This PR is to add comments to TestOptimizeDefaultForFuseWithValue in pkg/ddc/alluxio/transform_optimization_test.go

[xxxxxxyp]

Ⅰ. Describe what this PR does
This PR adds comments to the 'TestOptimizeDefaultForFuseWithValue' function in pkg/ddc/alluxio/transform_optimization_test.go, clarifying its purpose of updating dataset phase, conditions, and cache status based on runtime configuration. The comments follow the specified format and are placed before the function definition.

Ⅱ. Does this pull request fix one issue?
fixes #5101

Ⅲ. Special notes for reviews
No special notes. The comments adhere to the required format and have been verified against the function's logic for updating Alluxio dataset status.

[fluid-e2e-bot]

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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

[cheyang]

/lgtm
/approve

[cheyang]

Please fix go fmt issue by running make fmt.

[fluid-e2e-bot]

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