move client-go/util/connrotateion -> client-go/rest/dialer

[gaorong]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
This is a follow-up PR of #78016
see #78016 (comment)

the dialer in connrotation is not only used for credential rotation of long-lived connections, so move this package to a more general place.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

@smarterclayton @liggitt

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[yue9944882]

/ok-to-test

[gaorong]

/retest

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

@gaorong: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-node-e2e	00ef64f	link	/test pull-kubernetes-node-e2e
pull-kubernetes-integration	00ef64f	link	/test pull-kubernetes-integration

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[fedebongio]

/assign @smarterclayton

[dims]

/uncc

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