Hide stacktrace unless verbose mode is enabled

[danielhollas]

Closes #135

$ aiidalab-launch profiles edit invalid
Unexpected ValueError: Did not find profile with name 'invalid'.
Use verbose mode `aiidalab-launch --verbose` to see full stacktrace

I tried adding a test, but unfortunately the custom handler path is not exercised (see Codecov). Not very surprising that testing a custom exception handler in a testing framework does not work. 🤷

@csadorf this is ready for review.

[codecov]

Codecov Report

Merging #148 (9463682) into main (c7b6203) will decrease coverage by 0.13%.
The diff coverage is 71.42%.

❗ Current head 9463682 differs from pull request most recent head 23682b6. Consider uploading reports for the commit 23682b6 to get more accurate results

@@            Coverage Diff             @@
##             main     #148      +/-   ##
==========================================
- Coverage   86.27%   86.14%   -0.14%     
==========================================
  Files           9        9              
  Lines         889      895       +6     
==========================================
+ Hits          767      771       +4     
- Misses        122      124       +2     

Flag	Coverage Δ
py-3.10	86.03% <71.42%> (-0.14%)	⬇️
py-3.8	85.98% <71.42%> (-0.14%)	⬇️
py-3.9	86.09% <71.42%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiidalab_launch/__main__.py	79.16% <71.42%> (-0.25%)	⬇️

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[csadorf]

This is great! I just have a few minor things, but otherwise good.

[danielhollas]

@csadorf thanks for looking into it, agreed.