feat: [TKC-1434] execution namespace model

[vsukhin]

Pull request description

Checklist (choose whats happened)

• breaking change! (describe)
• tested locally
• tested on cluster
• added new dependencies
• updated the docs
• added a test

Breaking changes

Changes

Fixes

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 31.35593% with 81 lines in your changes are missing coverage. Please review.

Project coverage is 30.34%. Comparing base (7f2c566) to head (39c14b0).
Report is 9 commits behind head on develop.

Files	Patch %	Lines
pkg/scheduler/test_scheduler.go	6.97%	39 Missing and 1 partial ⚠️
...kg/executor/containerexecutor/containerexecutor.go	28.57%	13 Missing and 2 partials ⚠️
pkg/mapper/tests/openapi_kube.go	0.00%	7 Missing ⚠️
pkg/executor/containerexecutor/logs.go	0.00%	5 Missing ⚠️
pkg/scheduler/service.go	0.00%	4 Missing ⚠️
pkg/mapper/tests/kube_openapi.go	57.14%	3 Missing ⚠️
pkg/mapper/testsuiteexecutions/mapper.go	0.00%	3 Missing ⚠️
internal/app/api/v1/executions.go	60.00%	2 Missing ⚠️
pkg/api/v1/client/test.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5053      +/-   ##
===========================================
+ Coverage    30.32%   30.34%   +0.02%     
===========================================
  Files          314      315       +1     
  Lines        28149    28270     +121     
===========================================
+ Hits          8535     8578      +43     
- Misses       18783    18862      +79     
+ Partials       831      830       -1     

Flag	Coverage Δ
integrationtests	5.99% <0.00%> (-0.03%)	⬇️
unittests	26.20% <31.35%> (+0.04%)	⬆️

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