[backend/frontend] Implement injectExpectations per agent level

[savacano28]

Proposed changes

Related issues

• Closes Implement expectations results per agent level #2217

Checklist

• I consider the submitted work as finished
• 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)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

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]

Codecov Report

Attention: Patch coverage is 6.45161% with 87 lines in your changes missing coverage. Please review.

Project coverage is 33.11%. Comparing base (351f0fb) to head (28a8b58).
Report is 5 commits behind head on release/current.

Files with missing lines	Patch %	Lines
...a/io/openbas/service/InjectExpectationService.java	0.00%	46 Missing and 2 partials ⚠️
.../service/ExpectationsExpirationManagerService.java	0.00%	17 Missing ⚠️
...va/io/openbas/rest/expectation/ExpectationApi.java	0.00%	17 Missing ⚠️
...ava/io/openbas/service/InjectExpectationUtils.java	0.00%	3 Missing ⚠️
...nbas/injectors/openbas/OpenBASImplantExecutor.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #2228      +/-   ##
=====================================================
+ Coverage              32.90%   33.11%   +0.20%     
- Complexity              1512     1526      +14     
=====================================================
  Files                    582      583       +1     
  Lines                  17937    18177     +240     
  Branches                1154     1188      +34     
=====================================================
+ Hits                    5903     6019     +116     
- Misses                 11770    11882     +112     
- Partials                 264      276      +12     

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