chore: update codeowners (#28332)

Issue number: N/A

"Owning" a test didn't really work out like I expected/hoped. A lot of
changes to the test files were minor, so I ended up just getting
assigned to more-or-less random PRs. It wasn't really hurting anything,
but I might as well just let the bot assign me.

---------

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

Author: mapsandapps

.github/CODEOWNERS

@@ -81,10 +81,3 @@
 
 /core/src/css/ @brandyscarney
 /core/src/themes/ @brandyscarney
-
-# Tests
-
-**/datetime.e2e.ts @mapsandapps
-**/datetime-button.e2e.ts @mapsandapps
-**/icon.e2e.ts @mapsandapps
-**/loading.e2e.ts @mapsandapps