chore: improve ci stability

[WilliamBergamin]

This PR attempts to improve CI stability by bumping the memory limit of java, not evaliating coverage when its not needed and cleaning up the execution script

EDIT: extend the timeout (temporary fix)

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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[zimeg]

@WilliamBergamin Who knew more RAM is so simple to find? 🔍 ✨

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.31%. Comparing base (797d1c1) to head (a893841).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1563      +/-   ##
============================================
+ Coverage     73.28%   73.31%   +0.02%     
- Complexity     4513     4526      +13     
============================================
  Files           477      479       +2     
  Lines         14274    14321      +47     
  Branches       1487     1495       +8     
============================================
+ Hits          10461    10499      +38     
- Misses         2922     2934      +12     
+ Partials        891      888       -3     

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