Jetpack Settings: Fix staging site toggle label

[Initsogar]

The ToggleControl component requires a label prop according to its type definition, based on that, it was added the label prop in #78711 when updating @wordpress/components packages in Calypso.

The purpose of this PR is to move the toggle description to the label prop.

Proposed Changes

• Move the Jetpack staging site setting toggle description into the label prop in ToggleControl component to remove redundant texts.

Before	After

Testing Instructions

• Using a site with Jetpack VaultPress Backup and server credentials configured, navigate to Jetpack Cloud's settings page and ensure the Set up as staging site setting looks like the After screenshot.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-ajp-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-119be93fa337bf00e58f1217e1d9bd36a401aa53

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-119be93fa337bf00e58f1217e1d9bd36a401aa53&env=jetpack

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~22 bytes removed 📉 [gzipped])

name                    parsed_size           gzip_size
jetpack-cloud-settings        -92 B  (-0.0%)      -22 B  (-0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[noahtallen]

very nice!