Decouple application.js & cms.js and use only one pack file at a time

[alis-khadka]

Describe the bug
For the dashboard controller, we are including the cms.js as well as application.js file in here. Due to this, multiple dependencies like jquery, trix, turbo, rails-ujs, etc are being imported multiple times.

We need to decouple these cms.js and application.js file and use only one file at a time.

To Reproduce
Steps to reproduce the behavior:

1. Go to '/v2/dashboard'
2. Open the developer tools' console
3. See error

Expected behavior
Such error should not occur

Screenshots

[alis-khadka]

cc @Pralish