A4A: Update Migration and Site Tagging copies to be more clear and concise.

[jkguidaven]

Closes https://linear.app/a8c/issue/A4A-2022/update-the-wording-for-tagging-sites-as-its-confusing

Proposed Changes

• Agencies should know that they need to tag their own sites. So few of the copies are not accurate and need to be updated.

Why are these changes being made?

• We need to ensure our copies are clear and concise to set expectations and prevent misunderstandings.

Testing Instructions

• Use the A4A live link and navigate to /migrations/commissions.
• Make sure you don't have any existing migrations so the overview copies are rendered.
• Confirm the text is correct.

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 tested accessibility for your changes? Ensure the feature remains usable with various user agents (e.g., browsers), interfaces (e.g., keyboard navigation), and assistive technologies (e.g., screen readers) (PCYsg-S3g-p2).
• 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 UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• 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-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172247

Jetpack Cloud Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172247&env=jetpack

Automattic for Agencies Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172247&env=a8c-for-agencies

Dashboard Live (dotcom) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172247&env=dashboard

Dashboard Live (CIAB) (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-172247&env=dashboard-ciab

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/32465866

Some locales (Hebrew) have been temporarily machine-translated due to translator availability. All other translations are usually ready within a few days. Untranslated and machine-translated strings will be sent for translation next Monday and are expected to be completed by the following Friday.

Thank you @jkguidaven for including a screenshot in the description! This is really helpful for our translators.