fix: propagate context through dataflow affinity job paths

[CAICAIIs]

What this PR does

Related to #5705.
This PR continues the context propagation work from #5705 by wiring the reconcile context.Context through DataFlowAffinity job reconciliation paths.

It updates the DataFlowAffinity job controller to use context-aware kubeclient helpers when:

• fetching the reconciled Job
• listing the succeeded Pod for a completed Job
• fetching the Pod's Node
• updating injected Job annotations

It also adds context-aware Job and Node helper variants while keeping the existing helper APIs as compatibility wrappers.

Why this is needed

Some DataFlowAffinity job paths still used helper functions backed by context.TODO(), so cancellation/deadline signals from the reconciler were not propagated through all Kubernetes client calls.

Tests

go test ./pkg/controllers/v1alpha1/fluidapp/dataflowaffinity -count=1 -v
go test ./pkg/utils/kubeclient -count=1 -v
GOTOOLCHAIN=go1.24.12 test -z "$($(GOTOOLCHAIN=go1.24.12 go env GOROOT)/bin/gofmt -l ./pkg ./cmd ./api)"

[fluid-e2e-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[fluid-e2e-bot]

Hi @CAICAIIs. Thanks for your PR.

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[gemini-code-assist]

Code Review

This pull request introduces WithContext variants for Kubernetes client operations (Get, Update, List) within the kubeclient utility and updates the DataOpJobReconciler to utilize these methods, effectively replacing context.TODO() with the reconciliation context. It also includes comprehensive unit tests to verify correct error handling when contexts are canceled. The review feedback suggests avoiding variable shadowing of the client package name, reducing code duplication by moving test helpers to a shared utility, and maintaining consistency by calling the client directly where wrappers do not add value.

[codecov]

Codecov Report

❌ Patch coverage is 31.37255% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.60%. Comparing base (ed9b7ef) to head (1870bb1).

Files with missing lines	Patch %	Lines
pkg/utils/fake/client.go	0.00%	35 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5880      +/-   ##
==========================================
- Coverage   61.65%   61.60%   -0.05%     
==========================================
  Files         480      480              
  Lines       32613    32656      +43     
==========================================
+ Hits        20108    20119      +11     
- Misses      10897    10930      +33     
+ Partials     1608     1607       -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
2.2% Duplication on New Code

See analysis details on SonarQube Cloud