Add PR description lint

[disa6302]

Issue #, if available:

What was changed?

• Add PR template check to CI and a PR template for this repo.

Why was it changed?

• To ensure that every PR that is opened has a clear description of the changes.

How was it changed?

• Created a PR template
• Created a CI job to run the description checker
• This PR needs to be targeted for merge in mainline since github does not pull in these changes from a non-mainline branch.

What testing was done for the changes?

• The same template exists in WebRTC SDK which has been working fine for the past few months.
• CI job in this PR to verify this description.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (de4299f) 16.23% compared to head (2eab2c0) 16.23%.

❗ Current head 2eab2c0 differs from pull request most recent head 942204c. Consider uploading reports for the commit 942204c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1143   +/-   ##
=======================================
  Coverage   16.23%   16.23%           
=======================================
  Files          51       51           
  Lines        6892     6892           
=======================================
  Hits         1119     1119           
  Misses       5773     5773           

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[stefankiesz]

Duplicate comment