Extend CacheRuntime phase 2 BUG FIX: ufs path empty

[xliuqq]

Ⅰ. Describe what this PR does

use GenUFSPathInUnifiedNamespace when Dataset Mount Path field is empty.

Ⅱ. Does this pull request fix one issue?

part of #5412

Ⅲ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[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

[gemini-code-assist]

Code Review

This pull request updates the UFS path generation logic in pkg/ddc/cache/engine/cm.go to use GenUFSPathInUnifiedNamespace and modifies a test configuration in test/gha-e2e/curvine/dataset.yaml by commenting out a path entry. Feedback was provided to remove a misleading comment in the Go code that incorrectly implies the path generation logic only handles empty paths, as the function itself is more robust.

[gemini-code-assist]

The comment added here is slightly misleading because GenUFSPathInUnifiedNamespace handles both cases: it uses the provided path if it is absolute, and defaults to /{m.Name} otherwise. The comment implies it only handles the empty case. Since the function name is already descriptive of its purpose, the comment is redundant and could be confusing if a path is actually provided. I suggest removing it to keep the code clean.

Suggested change

	// m.Path is empty, use /{m.Name}
	Path: utils.UFSPathBuilder{}.GenUFSPathInUnifiedNamespace(m),
	Path: utils.UFSPathBuilder{}.GenUFSPathInUnifiedNamespace(m),

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.93%. Comparing base (4fca3ab) to head (df67772).

Files with missing lines	Patch %	Lines
pkg/ddc/cache/engine/cm.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5833      +/-   ##
==========================================
- Coverage   58.94%   58.93%   -0.01%     
==========================================
  Files         479      479              
  Lines       32443    32444       +1     
==========================================
  Hits        19122    19122              
- Misses      11772    11773       +1     
  Partials     1549     1549              

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