Remove mock from test-requirements.txt

[jmontleon]

/kind cleanup

What this PR does / why we need it:

I believe f1dfdbb made this dependency unnecessary. It ends up adding an extra unavailable dependency for EPEL packages preventing it from installing.

https://bugzilla.redhat.com/show_bug.cgi?id=2313896 has more information.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jmontleon / name: Jason Montleon (10ced92)

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[yliaog]

/lgtm
/approve

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[yliaog]

/release-note-none