Fixes for TestSuiteSelector and TestSuiteSourceCreationComponent

[sanyavertolet]

This PR closes #1079

What's done:

• Added (returned back) testSuiteSelector for general tests - all the avaliable ones
• Fixed an issue with TestSuiteSelector in browser mode - now input form is cleared when an entity from avaliable list is chosen
• Fixed an issue with unclosing modal - now when TestSuiteSource is successfully created, a new request for a fetch is sent

[codecov]

Codecov Report

Merging #1091 (9719041) into master (3147930) will decrease coverage by 0.12%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1091      +/-   ##
============================================
- Coverage     43.78%   43.65%   -0.13%     
  Complexity      562      562              
============================================
  Files           176      176              
  Lines          5338     5344       +6     
  Branches        506      506              
============================================
- Hits           2337     2333       -4     
- Misses         2819     2829      +10     
  Partials        182      182              

Impacted Files	Coverage Δ
.../backend/controllers/TestSuitesSourceController.kt	6.52% <0.00%> (-0.15%)	⬇️
...ol/save/backend/service/TestSuitesSourceService.kt	70.31% <0.00%> (-1.12%)	⬇️
...mponents/basic/TestSuiteSourceCreationComponent.kt	0.00% <0.00%> (ø)
...ponents/basic/contests/ContestCreationComponent.kt	0.00% <ø> (ø)
...nents/basic/testsuiteselector/TestSuiteSelector.kt	0.00% <ø> (ø)
.../testsuiteselector/TestSuiteSelectorBrowserMode.kt	0.00% <0.00%> (ø)
...otlin/com/saveourtool/save/frontend/utils/Utils.kt	0.00% <0.00%> (-33.34%)	⬇️
...ve/frontend/components/basic/ManageUserRoleCard.kt	40.42% <0.00%> (-4.26%)	⬇️

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