chore: reopen discussion in .asf.yml config

[imbajin]

Purpose of the PR

• enable discussion func again

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.33%. Comparing base (42f9a76) to head (9fdb05c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2751      +/-   ##
============================================
+ Coverage     46.91%   48.33%   +1.42%     
- Complexity      821      946     +125     
============================================
  Files           747      758      +11     
  Lines         60149    61299    +1150     
  Branches       7676     7873     +197     
============================================
+ Hits          28216    29629    +1413     
+ Misses        29109    28728     -381     
- Partials       2824     2942     +118     

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