fix: handle deleted one-on-one details [WPB-8645]

[MohamadJaara]

https://wearezeta.atlassian.net/browse/WPB-8645

Summary

• tolerate one-on-one conversation rows where the other user id is missing
• mark that fallback user as deleted so clients can render the deleted account state instead of crashing
• add a mapper regression test for deleted 1:1 details

Tests

• ./gradlew :kalium:logic:jvmTest --tests com.wire.kalium.logic.data.conversation.ConversationMapperTest

[github-actions]

Test Results

0 tests   - 5 871   0 ✅  - 5 730   0s ⏱️ - 4m 25s
0 suites  -   889   0 💤  -   141 
0 files    -   889   0 ❌ ±    0 

Results for commit 6634c01. ± Comparison against base commit d57f18f.

♻️ This comment has been updated with latest results.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Bencher Report

Branch	${GITHUB_HEAD_REF}
Testbed	ubuntu-latest

⚠️ WARNING: No Threshold found!

Without a Threshold, no Alerts will ever be generated.

• Latency (nanoseconds (ns))

Click here to create a new Threshold
For more information, see the Threshold documentation.
To only post results if a Threshold exists, set the --ci-only-thresholds flag.

Click to view all benchmark results

Benchmark	Latency	microseconds (µs)
com.wire.kalium.benchmarks.logic.CoreLogicBenchmark.createObjectInFiles	📈 view plot ⚠️ NO THRESHOLD	884.36 µs
com.wire.kalium.benchmarks.logic.CoreLogicBenchmark.createObjectInMemory	📈 view plot ⚠️ NO THRESHOLD	336,087.96 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.inboxPagingDeepPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	133,668.59 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.inboxPagingFirstPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	130,848.87 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.localMarkAsReadBenchmark	📈 view plot ⚠️ NO THRESHOLD	3,986.49 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.messagePagingDeepPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	37,478.99 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.messagePagingFirstPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	21,923.41 µs
com.wire.kalium.benchmarks.persistence.MessagesNoPragmaTuneBenchmark.messageInsertionBenchmark	📈 view plot ⚠️ NO THRESHOLD	1,247,073.53 µs
com.wire.kalium.benchmarks.persistence.MessagesNoPragmaTuneBenchmark.queryMessagesBenchmark	📈 view plot ⚠️ NO THRESHOLD	20,246.40 µs

🐰 View full continuous benchmarking report in Bencher