add cashTrackingSession observe target #3257
Draft
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.

Background
This PR adds the
cash-tracking.event.observetarget to the UI-Extensions repo. This new target will replace the existingcash-tracking-session-complete.event.observeandcash-tracking-session-start.event.observetargets, which we will be deprecating in a follow-up PR.Solution
This PR follows implementation patterns for .observe targets in the ui-extensions repo.
Checklist