Improved IT and adding ignore group membership to build User

[navisatebi]

Refined IT to reflect changes.
Consolidated building user to retrieve label selector - logic moved to one single place.

[codecov]

Codecov Report

Merging #14 into master will increase coverage by 0.16%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   83.81%   83.97%   +0.16%     
==========================================
  Files          37       37              
  Lines         964      980      +16     
  Branches      101      103       +2     
==========================================
+ Hits          808      823      +15     
- Misses        107      108       +1     
  Partials       49       49              

Impacted Files	Coverage Δ
.../java/uk/ac/ebi/tsc/tesk/config/security/User.java	64.16% <88.00%> (+1.43%)	⬆️
.../tesk/config/security/AuthorisationProperties.java	100.00% <100.00%> (ø)
...tesk/config/security/ElixirPrincipalExtractor.java	96.55% <100.00%> (+0.25%)	⬆️
...c/tesk/util/component/KubernetesClientWrapper.java	63.23% <100.00%> (+0.54%)	⬆️
...sc/tesk/util/component/TesKubernetesConverter.java	90.37% <0.00%> (+0.74%)	⬆️

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