Replace most usage of go-autorest in unit tests

[mboersma]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Removes most of the remaining usages of the deprecated go-autorest package in unit tests.

Which issue(s) this PR fixes:

Refs #2974

Special notes for your reviewer:

This leaves only the somewhat trickier use of autorest.Environment in the codebase, which we can address separately.

• cherry-pick candidate

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3d03ba2) 61.95% compared to head (ce24d80) 61.95%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4447   +/-   ##
=======================================
  Coverage   61.95%   61.95%           
=======================================
  Files         188      188           
  Lines       18768    18768           
=======================================
  Hits        11628    11628           
  Misses       6502     6502           
  Partials      638      638           

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[mboersma]

Data race condition detected in two unit tests: will fix.

[nojnhuh]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 170d774a5063c226931bc83f8bde5ec59b0b4446

[nojnhuh]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7a5c0f3c474f36a8d5ba83c7121ae9da5ea3886f

[CecileRobertMichon]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CecileRobertMichon

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[nojnhuh]

I forgot to mention this is an A++ branch name. Excellent work.