[v1.3.1] Update change log, version numbers and .md files for release

[kar-rahul-aws]

Description

Release preparation for v1.3.1

Update changelog for version v1.3.1 Update version tag in .md files and manifest files

Test Steps

Checklist:

• [x] I have tested my changes. No regression in existing tests.
• [x] I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

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