mockgen deprecated: use uber-go/mock instead

[sebrandon1]

https://github.com/golang/mock is marked as archived as of June 27, 2023. They recommend using go.uber.org/mock.

This PR attempts to change the dependency to one that is maintained.

Tracking issue: redhat-best-practices-for-k8s/telco-bot#45

[openshift-ci]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 32.25806% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.34%. Comparing base (db73dbf) to head (c11bebf).

Files with missing lines	Patch %	Lines
pkg/util/mocks/cr-client.go	34.04%	27 Missing and 4 partials ⚠️
pkg/util/mocks/status-writer.go	26.66%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #271   +/-   ##
=======================================
  Coverage   58.34%   58.34%           
=======================================
  Files          26       26           
  Lines        1942     1942           
=======================================
  Hits         1133     1133           
  Misses        731      731           
  Partials       78       78           

Files with missing lines	Coverage Δ
pkg/util/mocks/condition/conditions.go	100.00% <ø> (ø)
pkg/util/mocks/gcpclient/client.go	82.75% <ø> (ø)
.../util/mocks/projectclaim/customeresourceadapter.go	78.04% <ø> (ø)
pkg/util/mocks/status-writer.go	38.09% <26.66%> (ø)
pkg/util/mocks/cr-client.go	38.57% <34.04%> (ø)

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[openshift-ci]

@sebrandon1: 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/validate	c11bebf	link	true	/test validate

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