Revert "Add @Required annotation with optional validator (#1558)"

[WilliamBergamin]

This reverts commit 372fff8.

In the future will will readresse this issues attempted to be resolved by this commit

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

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you agree to those rules.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.41%. Comparing base (ab70b31) to head (7205d0e).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...main/java/com/slack/api/util/json/GsonFactory.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1566   +/-   ##
=========================================
  Coverage     73.41%   73.41%           
+ Complexity     4534     4523   -11     
=========================================
  Files           479      477    -2     
  Lines         14330    14283   -47     
  Branches       1495     1487    -8     
=========================================
- Hits          10520    10486   -34     
+ Misses         2919     2910    -9     
+ Partials        891      887    -4     

Flag	Coverage Δ
jdk-14	73.41% <75.00%> (+<0.01%)	⬆️

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