Fix #1147 Improve the logic to extract the requestUserId for context objects

[seratch]

This pull request resolves #1147

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

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[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 8 lines in your changes missing coverage. Please review.

Project coverage is 74.31%. Comparing base (d5e0036) to head (ac3b54b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...m/slack/api/bolt/request/builtin/EventRequest.java	55.55%	3 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1375      +/-   ##
============================================
- Coverage     74.39%   74.31%   -0.08%     
- Complexity     4276     4278       +2     
============================================
  Files           461      461              
  Lines         13347    13364      +17     
  Branches       1370     1377       +7     
============================================
+ Hits           9930     9932       +2     
- Misses         2617     2624       +7     
- Partials        800      808       +8     

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