This PR updates the UI to reflect the changes to the implicit ^ and $
that we now add. The changes are:
1. Show input adornments for ^ and $ when you create a pattern.
2. Mention that ^ and $ are added implicitly in description.
3. Checks the example you provide against the pattern with added ^ and $
+ adds a test for that.
Points 1 and 2:
## Discussion point:
I have not touched the information about the pattern yet as the PR that
updates that is still in review (#4656), but it would be prudent to also
update that info to make it clearer. I can address that in a follow-up
PR.
