Fixes the Delete and Update webhook dialogs

[clacladev]

What does this pull request do? Explain your changes. (required)
Fixes the Delete and Update webhook dialogs, which were displayed behind the body of the content. Fixed the Event selector inside the Create/Update web hook dialog.

Specific updates (required)

• Displaying the Delete and Update webhook dialogs in front of the content
• Refactored the page breaking it down into smaller more manageable components
• Fixed the Events Select to make it work on all browsers (it was working only on Chrome!)
• Fixed the position of the Events dropdown to not overlap the Select box

How did you test each of these updates (required)
Tested on different browser and dark/light mode.

Does this pull request close any open issues?
Fixes #1340

Screenshots (optional):

Events Select all 3 major browsers:

[vercel]

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Name	Status	Preview	Updated
livepeer-studio	✅ Ready (Inspect)	Visit Preview	Oct 26, 2022 at 11:59AM (UTC)

[adamsoffer]

Looks good! I just noticed a few cosmetic issues related to webhooks that we may as well tackle in this issue as well.

1. Can we change this border from $primary7 to $neutral6

2. Can we fix this overflow text? Can use an ellipsis...

3. Can we fix this z-index on dialog overlays so that it covers the sidebar too?
   

[clacladev]

@adamsoffer I fixed the border color and the long urls overlapping. Good catch.

I would suggest that I fix the z-index issue in another PR, given that turns out ALL popups in the app have the same issue. Also, it turns out that ALL popups on smaller screens break.
Should I create a new issue and then work on it on a PR, or should I just work on a new PR?

[adamsoffer]

I would suggest that I fix the z-index issue in another PR, given that turns out ALL popups in the app have the same issue. Also, it turns out that ALL popups on smaller screens break.
Should I create a new issue and then work on it on a PR, or should I just work on a new PR?

Okay yeah in that case let's create a separate issue + PR to fix the dialog. Sounds good 👍

[adamsoffer]

LGTM! Can we just resolve that merge conflict? Then good to merge.