Added tests for AdminDBScanUnsupportedWorkflow

[jakobht]

What changed?
Added test for AdminDBScanUnsupportedWorkflow this makes the coverage of this file 87% (according to goland)

Some error cases are not tested, some are "the os failed" which cannot really be tested.

Why?
Increase coverage

How did you test it?

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.18%. Comparing base (221bbc7) to head (4016772).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tools/cli/admin_db_scan_command.go	50.00%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
tools/cli/admin_db_scan_command.go	78.82% <50.00%> (+24.70%)	⬆️

... and 6 files with indirect coverage changes

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