Enhancement - Email notification templates update script

[sohel-rp]

Description

Script to update the email notification template payload to contain all fields/keys similar to the slack notification.

Fixes - https://github.com/devtron-labs/devtron/issues/2130

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

All tests have been performed manually.

Checklist:

• [x] The title of the PR states what changed and the related issues number (used for the release note).
• [ ] Does this PR require documentation updates?
• [ ] I've updated documentation as required by this PR.
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have tested it for all user roles
• [ ] I have added all the required unit/api test cases