feat(KFLUXUI-191): allow users to set context

[CryptoRodeo]

Allows users to set context values, both in the edit and create integration page.

By default the 'application' context should be selected when creating a new integration test.

Backport of openshift/hac-dev#997

[codecov]

Codecov Report

Attention: Patch coverage is 90.86294% with 18 lines in your changes missing coverage. Please review.

Project coverage is 79.72%. Comparing base (850c442) to head (9ab84de).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
.../components/IntegrationTests/ContextSelectList.tsx	89.36%	10 Missing ⚠️
src/components/IntegrationTests/ContextsField.tsx	90.62%	6 Missing ⚠️
...nTests/IntegrationTestForm/IntegrationTestView.tsx	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   79.61%   79.72%   +0.11%     
==========================================
  Files         564      567       +3     
  Lines       20991    21200     +209     
  Branches     5200     5263      +63     
==========================================
+ Hits        16712    16902     +190     
- Misses       4254     4274      +20     
+ Partials       25       24       -1     

Flag	Coverage Δ
unittests	79.72% <90.86%> (+0.11%)	⬆️

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[CryptoRodeo]

Code coverage should be safe to ignore, based on what I've seen. Most of the lines it's complaining about were not added in this PR.

Other lines don't seem to make sense, for example it complains about this line:

export const ContextSelectList: React.FC<ContextSelectListProps> = ({

Yet that component is imported for it's spec test: https://github.com/konflux-ci/konflux-ui/pull/25/files#diff-bafded342a2a58bdb6604e41999d92487b1389c783dad27db3f76713604c87ffR3