[release-4.19] NO-ISSUE: Add pprof endpoint to machine-controller-manager

[perdasilva]

Cherry-pick of #189 to release-4.19.

Summary

• Serve net/http/pprof handlers over TLS on a dedicated port (default :6060) so heap, goroutine, and allocs profiles are available via oc port-forward without rebuilding
• The server runs on all replicas regardless of leader election
• New --pprof-bind-address CLI flag to configure the endpoint binding

Test Plan

• make unit passes with race detector
• make vet and gofmt clean
• Unit test: TLS startup and endpoint responsiveness
• Unit test: graceful shutdown behavior

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[perdasilva]

/hold testing

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

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws	34f6a1f	link	true	/test e2e-aws

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