[CIS-1223] Fix API requests being cancelled on first connect

[evsaev]

🔗 Issue Link

CIS-1223

🎯 Goal

To fix pending API requests being cancelled when chat client is connected for the first time.

🛠 Implementation

Added the check to explicitly handle the first connect.

🧪 Testing

The way to see the fix in action is to have a ChannelVC that connects a client in setUp after calling super.setUp where the channel request is initiated:

final class ChannelVC: ChatChannelVC {
    var token: Token!
    var userId: UserId!

    override func setUp() {
        super.setUp()

        client.connectUser(
            userInfo: .init(id: userId),
            token: token
        )
    }
    
    deinit {
        client.disconnect()
    }
}

☑️ Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)

[codecov]

Codecov Report

Merging #1538 (aeb4c72) into main (390114f) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1538      +/-   ##
==========================================
- Coverage   88.32%   88.32%   -0.01%     
==========================================
  Files         231      231              
  Lines       10838    10850      +12     
==========================================
+ Hits         9573     9583      +10     
- Misses       1265     1267       +2     

Flag	Coverage Δ
llc-tests	88.32% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Sources/StreamChat/Workers/ChatClientUpdater.swift	94.33% <100.00%> (+0.72%)	⬆️
...urces/StreamChat/Utils/MainQueue+Synchronous.swift	66.66% <0.00%> (-33.34%)	⬇️

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