Replace slack with discord

[kalaiyarasiganeshalingam]

Purpose

$Subject

Related to ballerina-platform/ballerina-library#3463

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Base: 95.49% // Head: 95.49% // No change to project coverage 👍

Coverage data is based on head (7a2ee15) compared to base (d3e5c9e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #398   +/-   ##
=======================================
  Coverage   95.49%   95.49%           
=======================================
  Files           3        3           
  Lines         111      111           
  Branches       62       62           
=======================================
  Hits          106      106           
  Misses          5        5           

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