Move score from lnk_contest_execution to execution

[petertrr]

• Move score from lnk_contest_execution to execution
• Forbid rerun of TestingType.CONTEST_MODE executions on backend
• Get best_score directly from lnk_contest_project (this column is not being set yet, will be added in subsequent PRs)

Second part of #1115

[codecov]

Codecov Report

Merging #1156 (23546ea) into master (1e86316) will increase coverage by 0.14%.
The diff coverage is 14.28%.

❗ Current head 23546ea differs from pull request most recent head e57c741. Consider uploading reports for the commit e57c741 to get more accurate results

@@             Coverage Diff              @@
##             master    #1156      +/-   ##
============================================
+ Coverage     42.90%   43.04%   +0.14%     
- Complexity      559      561       +2     
============================================
  Files           179      179              
  Lines          5372     5373       +1     
  Branches        518      517       -1     
============================================
+ Hits           2305     2313       +8     
+ Misses         2880     2871       -9     
- Partials        187      189       +2     

Impacted Files	Coverage Δ
...backend/controllers/LnkContestProjectController.kt	7.77% <0.00%> (ø)
...save/backend/controllers/RunExecutionController.kt	70.58% <0.00%> (-2.14%)	⬇️
...save/backend/service/LnkContestExecutionService.kt	27.27% <ø> (+7.27%)	⬆️
...l/save/backend/service/LnkContestProjectService.kt	15.00% <0.00%> (-0.79%)	⬇️
...veourtool/save/backend/service/ExecutionService.kt	79.16% <100.00%> (+0.21%)	⬆️
...ol/save/orchestrator/service/HeartBeatInspector.kt	72.41% <0.00%> (+1.72%)	⬆️
...ve/frontend/components/basic/ManageUserRoleCard.kt	48.78% <0.00%> (+14.63%)	⬆️

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