[Fix] Make codecov action optional in workflows

[kyzooghost]

This PR implements issue(s) #543

Checklist

• I wrote new tests for my new core changes.
• I have successfully ran tests, style checker and build against my new changes locally.
• I have informed the team of any breaking changes if there are any.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.49%. Comparing base (d29cdd4) to head (5964d69).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #559   +/-   ##
=========================================
  Coverage     68.49%   68.49%           
  Complexity     1130     1130           
=========================================
  Files           321      321           
  Lines         12842    12842           
  Branches       1287     1287           
=========================================
  Hits           8796     8796           
  Misses         3506     3506           
  Partials        540      540           

Flag	Coverage Δ		*Carryforward flag
hardhat	98.74% <ø> (ø)		Carriedforward from 5cb7752
kotlin	66.05% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.