[feat] Stop execution with an error when a cli module fails to load

[ekouts]

The output will look something like this:

$ reframe -m wrong_module -v ...
[ReFrame Setup]
...

./bin/reframe: could not load module 'wrong_module' correctly
Log file(s) saved in ...

With -vv then the output is:

$ reframe -m wrong_module -vv ...
[ReFrame Setup]
...

./bin/reframe: could not load module 'wrong_module' correctly
./bin/reframe: could not execute module operation: command 'modulecmd python show wrong_module' failed with exit code 0:
--- stdout ---
--- stdout ---
--- stderr ---
ModuleCmd_Display.c(157):ERROR:105: Unable to locate a modulefile for 'wrong_module'


--- stderr ---
Log file(s) saved in ...

Closes #2597 .

[codecov-commenter]

Codecov Report

Base: 86.69% // Head: 86.68% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (67db7c9) compared to base (9f0d167).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2603      +/-   ##
==========================================
- Coverage   86.69%   86.68%   -0.01%     
==========================================
  Files          59       59              
  Lines       10868    10869       +1     
==========================================
  Hits         9422     9422              
- Misses       1446     1447       +1     

Impacted Files	Coverage Δ
reframe/frontend/cli.py	72.18% <0.00%> (-0.12%)	⬇️

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