[KEP-5440] Graduate mutable suspended Job features to stable

[Utkarshpandey0001]

Description

Graduate MutablePodResourcesForSuspendedJobs and MutableSchedulingDirectivesForSuspendedJobs to Stable in Kubernetes v1.38. The lifecycle metadata preserves Alpha history, records Beta through v1.37, and marks both gates enabled and locked from v1.38.

Update the Job documentation so it no longer implies that v1.38 users must manually enable a locked GA gate, and clarify that active Pods must have terminated before scheduling directives can be updated. This documentation PR introduces no new API or usage workflow.

Validation: git diff --check and scope/shortcode checks passed. Verified the wording against the core PR's Job strategy and controller. make build stopped at the uninitialized api-ref-generator submodule; Hugo is also unavailable locally.

Kept as a draft pending the Stable KEP and core GA PRs:

• KEP-5440: prepare stable graduation for v1.38 enhancements#6307
• KEP-5440: graduate suspended Job features to GA kubernetes#141784

Issue

Related to kubernetes/enhancements#5440

/sig apps
/sig docs

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