chore: improve flaky tests

[WilliamBergamin]

Summary

This PR aims to improve flaky tests in our CI pipeline and consolidate the mock socket mode clients found in this project

Testing

Ran the Ci pipeline a few times did not observe any flaking tests

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.01%. Comparing base (5c57a32) to head (1ef964c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1615      +/-   ##
==========================================
+ Coverage   84.89%   85.01%   +0.11%     
==========================================
  Files         113      113              
  Lines       12639    12639              
==========================================
+ Hits        10730    10745      +15     
+ Misses       1909     1894      -15     

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[WilliamBergamin]

I believe this line is creating more stability; taken from bolt-python

[seratch]

Thank you! This is AMAZING