Revert "Add UnitOperation resource"

[melinath]

Reverts #15489

That PR introduced some custom code that's not behaving properly because it uses resource.Retry (which comes from a testing package) instead of transport_tpg.Retry as expected.

`google_saas_runtime_unit_operation` (revert)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 477 deletions(-))
google-beta provider: Diff ( 6 files changed, 2 insertions(+), 2178 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 309 deletions(-))

Breaking Change(s) Detected

The following breaking change(s) were detected within your pull request.

• Resource google_saas_runtime_unit_operation was either removed or renamed - reference

If you believe this detection to be incorrect please raise the concern with your reviewer.
If you intend to make this change you will need to wait for a major release window.
An override-breaking-change label can be added to allow merging.

Errors

google-beta provider:

• Error reading file website/docs/r/saas_runtime_unit_operation.html.markdown

[modular-magician]

Tests analytics

Total tests: 12
Passed tests: 12
Skipped tests: 0
Affected tests: 0

Click here to see the affected service packages

• saasruntime

🟢 All tests passed!

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