Capture ImportTestRun as dry-run success

[GeigerJ2]

Fixes #6401

In the _import_archive_and_migrate function, the ImportTestRun exception is specifically captured, success communicated to the user, and the function returned to not print the final echo_successs which is issued after actual archive import into the profile.

[sphuber]

Thanks @GeigerJ2 Changes look good. Just kind of surprised that this wasn't tested yet. Could you please add a quick test? Should be very straightforward to add in tests/cmdline/commands/test_archive_import.py. Just need to make sure the command finishes correctly as opposed to excepting like it does now 😄

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 77.65%. Comparing base (ef60b66) to head (7f377fc).
Report is 9 commits behind head on main.

Files	Patch %	Lines
src/aiida/cmdline/commands/cmd_archive.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6403      +/-   ##
==========================================
+ Coverage   77.51%   77.65%   +0.15%     
==========================================
  Files         560      562       +2     
  Lines       41444    41656     +212     
==========================================
+ Hits        32120    32345     +225     
+ Misses       9324     9311      -13     

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[sphuber]

Thanks @GeigerJ2