Move and rename Sentry constants

What does this MR do and why?

This change refactors our Sentry constants so they can be reused.

It also renames one of them to use the naming as newer versions of Sentry

I've split this change into different MRs, to make it easier to review:

Remove unusable Sentry feature flag (!104231 - merged)	about to be merged!
Move and rename Sentry constants (!104247 - merged)	you are here ☝
Install two versions of Sentry Client SDK (!102790 - merged)	the big one!

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