[CI][v5] Implement new cross-platform mock server

[testableapple]

🔗 Issue Links

Resolve https://linear.app/stream/issue/IOS-932

🎯 Goal

Share mock server across mobile platforms.

🛠 Implementation

CI related:

• Get rid of Swifter
• Implement a custom mock server using Sinatra
• Move all the existing ruby/sinatra scripts to the mock server
• Unblock some tests that were blocked due to Swifter flakiness
• Comment out the iOS 16 e2e cron check due to unexpected hanging (also happens on develop)

SDK related:

• Add willSendMessage to composer

📝 Notes

• Mock server related PR.
• Android related PR.
• UIKit related PR.
• Code review and old Xcode checks also fail on v5 branch, keeping them as they are to avoid overcomplicating this PR.

🧪 Testing

On CI:

• Cron checks

Locally:

bundle exec fastlane start_mock_server
bundle exec fastlane test_e2e_mock device:"iPhone 17" # or run any test(s) on Xcode
bundle exec fastlane stop_mock_server

[github-actions]

	1 Warning
⚠️	Big PR

	1 Message
📖	There seems to be app changes but CHANGELOG wasn't modified. Please include an entry if the PR includes user-facing changes. You can find it at CHANGELOG.md.

Generated by 🚫 Danger

[github-actions]

Public Interface

🚀 No changes affecting the public interface.

[laevandus]

✅

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamChatSwiftUI	9.78 MB	10.23 MB	+466 KB	🟡

[sonarqubecloud]

Quality Gate failed

Failed conditions
77.6% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[Stream-SDK-Bot]

StreamChatSwiftUI XCSize

Object	Diff (bytes)
MessageViewFactoryOptions.o	+29403
AttachmentViewFactoryOptions.o	+24961
ChannelViewFactoryOptions.o	+23421
ComposerViewFactoryOptions.o	+18636
SearchResultsView.o	+18621

Show 262 more objects

Object	Diff (bytes)
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TaskFetchOriginalImageData.o	-12493
MessageRepliesView.o	+12071
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