fix: Missing MLS Conversation (WPB-7085)

[github-actions]

Cherry pick from the original PR:

• fix: Missing MLS Conversation (WPB-7085) #2617

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⚠️ Conflicts during cherry-pick:

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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
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  • answers the question: If merged, this PR will: ... ³

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What's new in this PR?

Issues

In the logs we would get errors: followed by

Solutions

As we receive the from the MLSWelcome event, we can first try to fetch conversation if its unknown then get MLSClient

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Testing

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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. .

[github-actions]

Test Results

2 961 tests  ±0   2 841 ✔️ ±0   2m 38s ⏱️ +9s
   514 suites ±0      120 💤 ±0 
   514 files   ±0          0 ❌ ±0 

Results for commit 3e0e71f. ± Comparison against base commit 053107e.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

Datadog Report

All test runs 4089605 🔗

✅ 2 Total Test Services: 0 Failed, 2 Passed

Test Services

Service Name	Failed	Known Flaky	New Flaky	Passed	Skipped	Wall Time	Test Service View
kalium-ios	0	0	0	2090	37	11.11s	Link
kalium-jvm	0	0	0	2841	120	9m 2.04s	Link

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.59%. Comparing base (053107e) to head (3e0e71f).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2629      +/-   ##
=============================================
- Coverage      58.60%   58.59%   -0.01%     
  Complexity         7        7              
=============================================
  Files           1183     1183              
  Lines          45929    45928       -1     
  Branches        4331     4331              
=============================================
- Hits           26916    26912       -4     
- Misses         17079    17081       +2     
- Partials        1934     1935       +1     

Files	Coverage Δ
...nc/receiver/conversation/MLSWelcomeEventHandler.kt	90.32% <100.00%> (-0.16%)	⬇️

... and 3 files with indirect coverage changes

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