DRA: lock to default-on

[pohly]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

The core functionality was enabled by default in 1.34 without any issues that would have suggested turning it off, so now we can lock it to on-by-default.

Which issue(s) this PR is related to:

KEP: kubernetes/enhancements#4381

Special notes for your reviewer:

Does this PR introduce a user-facing change?

DRA: the DynamicResourceAllocation feature gate for the core functionality (GA in 1.34) is now locked to enabled-by-default and thus cannot be disabled anymore.

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This pull-request has been approved by: pohly
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[pohly]

/sig node

[k8s-ci-robot]

@pohly: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-unit	7c0f7ca	link	true	/test pull-kubernetes-unit
pull-kubernetes-verify	7c0f7ca	link	true	/test pull-kubernetes-verify
pull-kubernetes-integration	7c0f7ca	link	true	/test pull-kubernetes-integration

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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