feat: Create observer for legal hold state (WPB-5442)

[ohassine]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Description

This PR aims to create two use cases to observe legal hold state of a other user or current one.

Needs releases with:

• GitHub link to other pull request

Testing

Test Coverage (Optional)

• I have added automated test to this contribution
• [ ]

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Unit Test Results

   348 files   - 128     348 suites   - 128   11s ⏱️ - 2m 12s
1 878 tests  - 775  1 848 ✔️  - 701  30 💤  - 74  0 ❌ ±0 

Results for commit 4ac4b31. ± Comparison against base commit 8ee46ea.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

Datadog Report

All test runs 680e24c 🔗

✅ 2 Total Test Services: 0 Failed, 0 with New Flaky, 2 Passed

Test Services

Service Name	Failed	Known Flaky	New Flaky	Passed	Skipped	Wall Time	Branch View
kalium-ios	0	0	0	1844	30	13.12s	Link
kalium-jvm	0	0	0	2551	104	7m 13.05s	Link

[codecov-commenter]

Codecov Report

Merging #2251 (4ac4b31) into develop (8ee46ea) will increase coverage by 0.01%.
Report is 1 commits behind head on develop.
The diff coverage is 94.44%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2251      +/-   ##
=============================================
+ Coverage      57.92%   57.94%   +0.01%     
  Complexity        21       21              
=============================================
  Files           1084     1086       +2     
  Lines          41093    41106      +13     
  Branches        3804     3804              
=============================================
+ Hits           23804    23819      +15     
+ Misses         15662    15661       -1     
+ Partials        1627     1626       -1     

Files	Coverage Δ
...re/legalhold/ObserveLegalHoldForSelfUserUseCase.kt	100.00% <100.00%> (ø)
...e/legalhold/ObserveLegalHoldStateForUserUseCase.kt	100.00% <100.00%> (ø)
...eature/legalhold/ObserveLegalHoldRequestUseCase.kt	61.53% <80.00%> (ø)

... and 2 files with indirect coverage changes

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