Revert "Disable flutter_devtools.test" (#455)

Reverts #452 now that
flutter/website#11904 has landed and updates the
DevTools hash to include a skipped test
(flutter/devtools#9150) that was hitting the
network against the [test
guidelines](https://github.com/flutter/tests?tab=readme-ov-file#adding-more-tests).

Author: kenzieschmoll

registry/flutter_devtools.test.disabled registry/flutter_devtools.testregistry/flutter_devtools.test.disabled renamed to registry/flutter_devtools.test

@@ -7,7 +7,7 @@ fetch=git -c core.longPaths=true clone https://github.com/flutter/devtools.git t
 # NOTE: this commit hash should also match the hash in flutter_devtools_analysis.test.
 # The analysis and testing for DevTools have been split into two different
 # registry to speed up performance.
-fetch=git -c core.longPaths=true -C tests checkout 67a84729537ea5011f5ee909613133006eb47e92
+fetch=git -c core.longPaths=true -C tests checkout 4fdf69d2ef038173824ed61096224e020be094f9
 
 setup.linux=./tool/flutter_customer_tests/setup.sh >> output.txt