Replace slack channel link with discord server link

[MohamedSabthar]

Purpose

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: 93.78% // Head: 93.78% // No change to project coverage 👍

Coverage data is based on head (70d9edd) compared to base (f0800a7).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #76   +/-   ##
=========================================
  Coverage     93.78%   93.78%           
  Complexity      393      393           
=========================================
  Files            29       29           
  Lines          1367     1367           
  Branches         86       86           
=========================================
  Hits           1282     1282           
  Misses           58       58           
  Partials         27       27           

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