Show TestCase tag in TestCase search page

[asankov]

Refs #715, #123

The logic for showing tags is basically the same as showing components since the relation is same. Thus I extracted the shared code into functions - loadResources and getFromCache and everything worked as expected

[codecov-io]

Codecov Report

Merging #748 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #748   +/-   ##
=======================================
  Coverage   64.93%   64.93%           
=======================================
  Files         111      111           
  Lines        5824     5824           
  Branches      770      770           
=======================================
  Hits         3782     3782           
  Misses       1807     1807           
  Partials      235      235

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[coveralls]

Pull Request Test Coverage Report for Build 2428

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 64.484%

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Totals
Change from base Build 2426:	0.0%
Covered Lines:	4015
Relevant Lines:	5824

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💛 - Coveralls