[Remove Vuetify from Studio] Buttons in edit channel details

[z-ABYa]

Fixes #5485

Summary

Migrated the following buttons and confirmation dialog in Channels > Edit channel details/New channel:

• Replaced MessageDialog by KModal
• Replaced VBtn with the most suitable KButton

1. Unsaved changes dialogue box:
   (Before when using MessageDialog)

(After when using KModal)

2. Editing already existing channel (No changes)

3. Creating new channel (No changes)

[MisRob]

Thank you @z-ABYa, we will assign a reviewer within next two weeks. Meanwhile, would you resolve the conflicts?

[z-ABYa]

I would like to if you can guide me in the right direction. Thanks @MisRob!

[MisRob]

@z-ABYa there's plenty of resources on Internet about conflict resolution - I recommend to spend some time studying them and playing around with git.

[MisRob]

Hi @z-ABYa, are you planning to come back to this? We're happy to review, but it would be more meaningful after the conflicts are resolved.

[z-ABYa]

Hi @MisRob, these are the conflicts from the previous PR #5481 that i have made changes to and now passed all checks and is waiting to be reviewed by @akolson. Also, do i have to make same changes here too?

[MisRob]

@z-ABYa this PR needs to have changes only for #5485, and therefore not include any changes in #5481.

You can adjust this PR in this way, but it may be easier to close it and open a new PR?

Next time, create two separate branches from unstable - a PR needs to contain changes relevant to the linked issue.

[z-ABYa]

Oh okay i can make a new PR. As for the branch i did made a new branch just for this commit - different from the one used in #5481

[z-ABYa]

Hi @MisRob, I made a new PR #5531 for the issue #5485. Have a look when you have some time.