[v5] Resolve target membership issues after migrating to buildable folders

[testableapple]

Relates to #3949

Also removed UISDKdocumentationTests folders as seems like the tests do not exist anymore in v5.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch v5-xcode-tests-membership-exceptions

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[github-actions]

	1 Warning
⚠️	Big PR

Generated by 🚫 Danger

[Stream-SDK-Bot]

SDK Size

title	v5	branch	diff	status
StreamChat	6.84 MB	6.84 MB	0 KB	🟢
StreamChatUI	4.49 MB	4.49 MB	0 KB	🟢
StreamChatCommonUI	0.92 MB	0.93 MB	+18 KB	🟢

[Stream-SDK-Bot]

StreamChatCommonUI XCSize

Object	Diff (bytes)
Appearance+Images.o	+6653
Appearance.o	+1752
AudioPlaybackRateFormatter.o	+728
Appearance+DesignTokens.o	-64

[sonarqubecloud]

Quality Gate passed

Issues
19 New issues
0 Accepted issues

Measures
0 Security Hotspots
85.2% Coverage on New Code
0.1% Duplication on New Code

See analysis details on SonarQube Cloud