Only start the extender plugin when needed in scheduler-perf

[jgiannuzzi]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR simply changes how we run the scheduler-perf benchmarks by only starting the extender plugin when it's referenced in the configuration.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

What are the benchmark results of this change?

N/A

[linux-foundation-easycla]

• ✅login: jgiannuzzi / (951a0fc)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[sanposhiho]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jgiannuzzi, sanposhiho

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