[feat] Add command line option to exclude tests with a specific tag

[rsarm]

Closes #2170

[rsarm]

I'm nor sure here about the name of the option exclude-tags. And if we keep something like that, should we change --exclude to --exclude-names?

[codecov-commenter]

Codecov Report

Merging #2223 (1281e6f) into master (081d922) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@           Coverage Diff           @@
##           master    #2223   +/-   ##
=======================================
  Coverage   85.54%   85.54%           
=======================================
  Files          55       55           
  Lines        9747     9754    +7     
=======================================
+ Hits         8338     8344    +6     
- Misses       1409     1410    +1     

Impacted Files	Coverage Δ
reframe/frontend/cli.py	76.30% <66.66%> (-0.06%)	⬇️
reframe/frontend/filters.py	100.00% <100.00%> (ø)

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[ekouts]

Lgtm. I have a small comment but feel free to leave as it is.

[vkarak]

I agree with the comment of @ekouts and I have another minor one.

[vkarak]

I forgot about this, please add the relevant entry in the documentation (man page)

[vkarak]

I renamed the option to --exclude-tag and rearranged the order in which they are defined and documented.