[frontend] Disable buttons if contract is null

[savacano28]

Proposed changes

• Manage screens when a payload is deleted (disable buttons, set the correct tag as deleted).
• Validate if an inject has a contract.

Related issues

• https://github.com/OpenBAS-Platform/openbas/issues/1141

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality
• [ ] I wrote test cases for the relevant uses case
• [ ] I added/update the relevant documentation (either on github or on notion)
• [x] Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.32927% with 281 lines in your changes missing coverage. Please review.

Project coverage is 28.78%. Comparing base (8fd335b) to head (db4e3e3).

Files	Patch %	Lines
...io/openbas/scheduler/jobs/InjectsExecutionJob.java	0.00%	70 Missing :warning:
.../io/openbas/injectors/caldera/CalderaExecutor.java	0.00%	68 Missing :warning:
...nbas/injectors/openbas/OpenBASImplantExecutor.java	0.00%	34 Missing :warning:
...pi/src/main/java/io/openbas/utils/ResultUtils.java	0.00%	20 Missing :warning:
...c/main/java/io/openbas/service/MailingService.java	30.76%	18 Missing :warning:
...main/java/io/openbas/service/ChallengeService.java	0.00%	11 Missing :warning:
...in/java/io/openbas/rest/channel/ChannelHelper.java	65.51%	10 Missing :warning:
.../io/openbas/service/ScenarioToExerciseService.java	52.38%	9 Missing and 1 partial :warning:
...openbas/injectors/challenge/ChallengeExecutor.java	0.00%	6 Missing :warning:
.../io/openbas/injectors/channel/ChannelExecutor.java	0.00%	6 Missing :warning:
... and 10 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1193      +/-   ##
============================================
+ Coverage     28.61%   28.78%   +0.16%     
- Complexity     1279     1286       +7     
============================================
  Files           507      507              
  Lines         12964    13007      +43     
  Branches        742      736       -6     
============================================
+ Hits           3710     3744      +34     
- Misses         9096     9105       +9     
  Partials        158      158              

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