Introduce new release flow - Part 1

[varadarajan-tw]

This is the first PR in an attempt to introduce new release workflow for our deploys after the recent org level github permission changes.

This PR adds an event_dispatch workflow called version packages that can be triggered via GH CLI or API. The version packages workflow runs lerna version, commits the package version changes to branch and creates a release PR. Here is an example PR created.

Merging the version PR to main kicks off the publish workflow that uses lerna publish from-package instead of lerna publish from-git. The from-package command reads packages versions from package.json of all packages and publishes them if the version has changed.

from-git relies on tags to publish new version. Since we'll lose the tags in from-package workflow, new steps have been added to the release workflow to autogenerate package tags and push to main.

Testing

Tested the relase workflow on this branch.
Example PR created - #2139

For further testing and improvements to our deploy workflow, I would like to merge this to main.