[CIS-1888] Fix DM Channel with multiple members displaying only 1 user avatar

[nuno-vieira]

🔗 Issue Links

CIS-1888

🎯 Goal

Fix issue of DM Channel with multiple members and without channel image assigned showing the image of only one member instead of showing the merged avatar.

🛠 Implementation

Instead of using isDirectMessageChannel to show 1:1 avatar image for the channel, do this only if the memberCount is 2.

🎨 Showcase

The change can be seen in the new snapshot test added 👍

🧪 Manual Testing Notes

• Open Channel List
• Create a DM Channel with multiple users
• Verify that the DM Channel has the avatar merged

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• This change follows zero ⚠️ policy (required)
• Comparison screenshots added for visual changes
• Affected documentation updated (docusaurus, tutorial, CMS)

[evsaev]

🚢

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[emerge-tools]

⬆️ This change increases install size by 22.4 kB ⬆️

🗂 See the Emerge size breakdown

Item	Install size
➕ StreamChat.framework/SentryCrashIntegration.enrichScope:crashWrapper:	⬆️ 2.2 kB
➕ StreamChat.framework/SentryUIEventTracker.start	⬆️ 2.1 kB
StreamChat.framework/SentryCrashIntegration.configureScope	⬇️ 1.9 kB
➕ StreamChat.framework/SentryTracer.finishInternal	⬆️ 1.4 kB
StreamChat.framework/Strings.CFStrings	⬆️ 1.2 kB
➕ StreamChat.framework/SentryUIEventTracker.Objc Metadata	⬆️ 1.1 kB
➖ StreamChat.framework/SentryTracer.captureTransaction	⬇️ 1.0 kB
➕ StreamChat.framework/SentryTracer.initWithTransactionContext:hub:waitForChildren:idleTimeout:dispatchQueueWrapper:	848 B
StreamChat.framework/SentryTracer.Objc Metadata	827 B
StreamChat.framework/profiling.enumerateBacktracesForAllThreads	800 B
➕ StreamChat.framework/SentrySdkInfo.initWithDictInternal:orDefaults:	724 B
StreamChat.framework/SentryTracer.initWithTransactionContext:hub:waitForChildren:	708 B
➕ StreamChat.framework/SentryUIEventTrackingIntegration.Objc Metadata	685 B
StreamChat.framework/DYLD.String Table	576 B
StreamChat.framework/SentryProfiler.start	556 B
StreamChat.framework/SentrySdkInfo.initWithDict:	552 B
StreamChat.framework/Code Signature	520 B

🔎 See the full analysis (85143a9) merging into develop (00da858)

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