test: cover some missed classes of sync with unit test - PART 2 (WPB-3472)

[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?

Issues

Follow up PR of #1973 to increase sync unit test

Mainly covering ObserveSyncStateUseCase and ConversationEventReceiver with unit tests

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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

   422 files  +  2     422 suites  +2   2m 37s ⏱️ +45s
2 266 tests +27  2 168 ✔️ +27  98 💤 ±0  0 ❌ ±0 

Results for commit bbf1add. ± Comparison against base commit 3893877.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Merging #1974 (7167953) into develop (d826a6f) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop    #1974      +/-   ##
=============================================
+ Coverage      56.03%   56.26%   +0.22%     
  Complexity        49       49              
=============================================
  Files           1021     1021              
  Lines          37948    37946       -2     
  Branches        3451     3451              
=============================================
+ Hits           21266    21349      +83     
+ Misses         15244    15156      -88     
- Partials        1438     1441       +3     

Files Changed	Coverage Δ
.../wire/kalium/logic/data/sync/SlowSyncRepository.kt	75.86% <ø> (+10.34%)	⬆️
...m/logic/sync/receiver/ConversationEventReceiver.kt	100.00% <100.00%> (+100.00%)	⬆️

... and 5 files with indirect coverage changes

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[datadog-wireapp]

Datadog Report

All test runs d3ae658 🔗

✅ 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	1558	31	11.1s	Link
kalium-jvm	0	0	0	2178	99	5m 7s	Link