fix(e2ei): error handling (WPB-6271)

[mchenani]

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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?

Fixed and refactored the error handling for E2EI

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]

Test Results

2 809 tests   2 680 ✔️  33s ⏱️
   484 suites     129 💤
   484 files           0 ❌

Results for commit f8aaec3.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

Datadog Report

All test runs bae0b60 🔗

✅ 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	2680	129	12m 33.01s	Link
kalium-jvm	0	0	0	2805	123	8m 43.05s	Link

[codecov-commenter]

Codecov Report

Attention: 46 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release/candidate@5f9f8a8). Click here to learn what that means.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             release/candidate    #2522   +/-   ##
====================================================
  Coverage                     ?   58.43%           
  Complexity                   ?       22           
====================================================
  Files                        ?     1172           
  Lines                        ?    45468           
  Branches                     ?     4307           
====================================================
  Hits                         ?    26567           
  Misses                       ?    16966           
  Partials                     ?     1935           

Files	Coverage Δ
...um/logic/feature/e2ei/usecase/EnrollE2EIUseCase.kt	97.93% <100.00%> (ø)
...ire/kalium/logic/data/client/E2EIClientProvider.kt	74.35% <71.42%> (ø)
...gic/data/conversation/MLSConversationRepository.kt	82.33% <77.77%> (ø)
...re/kalium/network/api/base/unbound/acme/ACMEApi.kt	30.85% <14.28%> (ø)
...onMain/kotlin/com/wire/kalium/logic/CoreFailure.kt	25.82% <54.16%> (ø)
.../com/wire/kalium/logic/data/e2ei/E2EIRepository.kt	79.16% <68.75%> (ø)

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[borichellow]

Just a small style suggestion :)