[feat] Relax the regex matching for test names and tags

[vkarak]

We now use re.search() instead of re.match() for matching the name or tag patterns in the related cli options. So there is no need any more to prepend .* to a name pattern so as to match something in the middle of the test name.

Closes #2658

[codecov-commenter]

Codecov Report

Base: 86.61% // Head: 86.61% // No change to project coverage 👍

Coverage data is based on head (d2ea0d6) compared to base (db171e7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2736   +/-   ##
========================================
  Coverage    86.61%   86.61%           
========================================
  Files           60       60           
  Lines        11215    11215           
========================================
  Hits          9714     9714           
  Misses        1501     1501           

Impacted Files	Coverage Δ
reframe/frontend/filters.py	98.64% <100.00%> (ø)

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[victorusu]

lgtm