feat(juicefs): support worker volumeClaimTemplates

[CAICAIIs]

Ⅰ. Describe what this PR does

Support volumeClaimTemplates for JuiceFS worker StatefulSet.

This PR adds spec.volumeClaimTemplates to JuiceFSRuntime, passes it through JuiceFS value generation, and renders it into the worker StatefulSet. Worker volumeMounts can now reference either regular spec.volumes or spec.volumeClaimTemplates.

It also validates invalid worker volume configurations early:

• fails when a worker volumeMount cannot be resolved from either volumes or volumeClaimTemplates
• fails when a declared volumeClaimTemplate is not mounted by the worker
• rejects volumeClaimTemplates changes after the worker StatefulSet has been created, because StatefulSet volumeClaimTemplates are immutable

Ⅱ. Does this pull request fix one issue?

Fixes #5191

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

Added unit coverage for:

• worker volume mounts backed by volumeClaimTemplates
• unresolved worker volume mounts
• unmounted worker volumeClaimTemplates
• duplicate worker mounts referencing the same normal volume or claim template
• same-name normal volume and claim template precedence
• transform error propagation
• immutable worker volumeClaimTemplates sync behavior

Ⅳ. Describe how to verify it

go test ./pkg/ddc/juicefs -count=1 -v
make update-crd
make gen-openapi
helm lint charts/juicefs
helm lint charts/fluid/fluid

Also verified Helm rendering:

helm template test charts/juicefs \
  --set worker.enabled=true \
  --set 'worker.volumeClaimTemplates[0].metadata.name=cache' \
  --set 'worker.volumeClaimTemplates[0].spec.accessModes[0]=ReadWriteOnce' \
  --set 'worker.volumeClaimTemplates[0].spec.resources.requests.storage=1Gi'

[fluid-e2e-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[fluid-e2e-bot]

Hi @CAICAIIs. 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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[gemini-code-assist]

Code Review

This pull request introduces support for volumeClaimTemplates in the JuiceFSRuntime worker StatefulSet, enabling dynamic volume provisioning for JuiceFS workers. The changes encompass API and CRD updates, Helm chart modifications, and documentation revisions. The engine logic has been enhanced to manage the transformation of these templates and enforce their immutability during runtime synchronization. Furthermore, the testing suite underwent significant refactoring to replace gomonkey patching with function-based mocking, improving test stability and maintainability. I have no feedback to provide as there were no review comments to assess.

[codecov]

Codecov Report

❌ Patch coverage is 87.32394% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.13%. Comparing base (813d429) to head (a0aaf45).

Files with missing lines	Patch %	Lines
pkg/ddc/juicefs/shutdown.go	35.71%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5862      +/-   ##
==========================================
+ Coverage   59.10%   59.13%   +0.03%     
==========================================
  Files         480      480              
  Lines       32512    32556      +44     
==========================================
+ Hits        19215    19253      +38     
- Misses      11747    11754       +7     
+ Partials     1550     1549       -1     

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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
0.2% Duplication on New Code

See analysis details on SonarQube Cloud