Rename DRA feature gates to avoid conflict with upstream Kubernetes gates

[sohankunkerkar]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Renames DRA feature gates to avoid name collisions with upstream Kubernetes feature gates
(see #8871 for the scheduler-library integration where this became problematic):

Old (deprecated in 0.18)	New
DynamicResourceAllocation	KueueDRAIntegration
DRAExtendedResources	KueueDRAIntegrationExtendedResource

Upgrade scenarios

From	User config	What happens
0.14–0.16	DynamicResourceAllocation: true	Deprecation warning logged. Migrated → KueueDRAIntegration=true. DRA works.
0.17	DynamicResourceAllocation: true, DRAExtendedResources: true	Both deprecated warnings logged. Both migrated to new names. DRA works.
0.17	Updates config to KueueDRAIntegration: true, KueueDRAIntegrationExtendedResource: true	No migration needed. No warnings. DRA works.
0.18 fresh	KueueDRAIntegration: true	No migration needed. DRA works.
Mixed	DynamicResourceAllocation: true, KueueDRAIntegration: false (explicit)	Canonical gate wins (ExplicitlySet check). DRA disabled per user intent.
Invalid	KueueDRAIntegrationExtendedResource: true (no base gate)	Validate() rejects: "requires KueueDRAIntegration to be enabled". Startup fails.

Which issue(s) this PR fixes:

Fixes #11248

Special notes for your reviewer:

The e2e DRA config (test/e2e/config/dra/controller_manager_config.yaml) intentionally
keeps old gate names to exercise the migration path. The DRA e2e tests pass with this config.

Does this PR introduce a user-facing change?

NONE

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[Copilot]

Pull request overview

Renames Kueue's DRA-related feature gates (DynamicResourceAllocation → KueueDRAIntegration, DRAExtendedResources → KueueDRAIntegrationExtendedResource) to avoid name collisions with upstream Kubernetes feature gates. The old names are kept as Deprecated aliases for one release with an automatic migration step on startup.

Changes:

• Added new canonical feature gate names and marked the old ones Deprecated (to be removed in 0.19), with a MigrateDeprecatedDRAFeatureGates helper invoked from cmd/kueue/main.go before config validation.
• Updated all internal call sites (controllers, cache, dra, workload, validation), tests, KEP, site docs, and versioned feature list to use the new names.
• Extended Validate to require KueueDRAIntegration whenever KueueDRAIntegrationExtendedResource is enabled, and updated the legacy DRAExtendedResources check to accept either gate.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/features/kube_features.go	Adds new gate names, marks old ones Deprecated, and adds migration helper.
cmd/kueue/main.go	Calls migration before validation; uses new gate name for DRA mapper init.
pkg/config/validation.go	New validateDRAFeatureGateDependencies checking both new and legacy gate combinations.
pkg/config/validation_test.go	Replaces legacy dependency test with one for the new gate names.
pkg/controller/core/{core,workload_controller,indexer/indexer}.go	Switches gate references to new names; updates user-visible inadmissibility message.
pkg/controller/core/workload_controller_test.go	Updates fixtures to new gate names and expected message.
pkg/cache/queue/cluster_queue.go, pkg/dra/extended_resources.go, pkg/workload/workload*.go	Switches gate references to new names.
test/integration/.../dra/{suite_test,dra_test}.go, fairsharing/suite_test.go, multikueue/dra_test.go	Updates feature-gate names in integration tests.
keps/2941-DRA/kep.yaml	Replaces gate names in KEP metadata.
site/content/en/docs/{concepts/dynamic_resource_allocation,tasks/manage/setup_dra,tasks/run/dra}.md	Documents the rename and updates examples/text.
site/data/featuregates/versioned_feature_list.yaml, test/compatibility_lifecycle/reference/versioned_feature_list.yaml	Adds 0.18 Deprecated entries for old gates and Alpha entries for new ones.

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