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: https://github.com/redhat-best-practices-for-k8s/telco-bot/issues/45

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 41.57%. Comparing base (6d47107) to head (686fbda).

Files with missing lines	Patch %	Lines
...g/cloudclient/mock_cloudclient/mock_cloudclient.go	20.00%	4 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #424   +/-   ##
=======================================
  Coverage   41.57%   41.57%           
=======================================
  Files          27       27           
  Lines        2665     2665           
=======================================
  Hits         1108     1108           
  Misses       1478     1478           
  Partials       79       79           

Files with missing lines	Coverage Δ
pkg/cloudclient/cloudclient.go	83.33% <ø> (ø)
pkg/testutils/testutils.go	88.50% <ø> (ø)
...g/cloudclient/mock_cloudclient/mock_cloudclient.go	30.43% <20.00%> (ø)

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[sebrandon1]

/retest