fix(clone): honor request CSI mount config over checkpoint annotation

[BH4AWS]

During clone, the csi-volume-config annotation restored from the checkpoint could shadow a request-supplied CSI mount config. For agent-identity OSS mounts this dropped the credentialProviderName attribute, so sandboxCredProviderName was never injected and ossfs rejected the mount.

Persist the request-supplied config as raw JSON in createSandboxWithClone and override the checkpoint-restored csi-volume-config annotation with it in prepareSandboxFromCheckpoint when present. Behavior is unchanged when the request carries no CSI mount config.

Add table-driven coverage in TestPrepareSandboxFromCheckpoint_CSIMountConfigPrecedence.

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.02%. Comparing base (e549e5b) to head (ffad45e).

Files with missing lines	Patch %	Lines
pkg/servers/e2b/create.go	50.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
- Coverage   80.08%   80.02%   -0.07%     
==========================================
  Files         229      229              
  Lines       17831    17839       +8     
==========================================
- Hits        14280    14275       -5     
- Misses       2969     2978       +9     
- Partials      582      586       +4     

Flag	Coverage Δ
unittests	80.02% <60.00%> (-0.07%)	⬇️

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