Replace slack with discord

[xlight05]

Purpose

$Subject

Related to ballerina-platform/ballerina-library#3463

Goals

Describe the solutions that this feature/fix will introduce to resolve the problems described above

Approach

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User stories

Summary of user stories addressed by this change>

Release note

Brief description of the new feature or bug fix as it will appear in the release notes

Documentation

Link(s) to product documentation that addresses the changes of this PR. If no doc impact, enter “N/A” plus brief explanation of why there’s no doc impact

Training

Link to the PR for changes to the training content in https://github.com/wso2/WSO2-Training, if applicable

Certification

Type “Sent” when you have provided new/updated certification questions, plus four answers for each question (correct answer highlighted in bold), based on this change. Certification questions/answers should be sent to certification@wso2.com and NOT pasted in this PR. If there is no impact on certification exams, type “N/A” and explain why.

Marketing

Link to drafts of marketing content that will describe and promote this feature, including product page changes, technical articles, blog posts, videos, etc., if applicable

Automation tests

• Unit tests

  Code coverage information

• Integration tests

  Details about the test cases and coverage

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
• Ran FindSecurityBugs plugin and verified report? yes/no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes/no

Samples

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Related PRs

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Migrations (if applicable)

Describe migration steps and platforms on which migration has been tested

Test environment

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Learning

Describe the research phase and any blog posts, patterns, libraries, or add-ons you used to solve the problem.

[codecov]

Codecov Report

Base: 86.05% // Head: 86.05% // No change to project coverage 👍

Coverage data is based on head (1a52380) compared to base (b24ba6a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #636   +/-   ##
=========================================
  Coverage     86.05%   86.05%           
  Complexity       73       73           
=========================================
  Files            17       17           
  Lines           423      423           
  Branches         37       37           
=========================================
  Hits            364      364           
  Misses           34       34           
  Partials         25       25           

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