using time.Now().Sub -> time.Since

[coillteoir]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Updating autoscaler test code to use time.Since, instead of time.Now().Sub()

It is more concise, and up to date with the standard library best practices.

Which issue(s) this PR fixes:

NONE

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: coillteoir / name: David Lynch (0a00f87, 82aeec7)

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