Update on "[build] Add editable mode unittest"

As titled. To do this we need to refactor the arguments being passed
into `setup-linux.sh` `setup-macos.sh` and `unittest-linux.sh`
`unittest-macos.sh`.

[ghstack-poisoned]

Author: larryliu0820

.github/workflows/trunk.yml

@@ -150,7 +150,7 @@ jobs:
         conda activate "${CONDA_ENV}"
 
         source .ci/scripts/utils.sh
-        install_executorch "use-pt-pinned-commit"
+        install_executorch "--use-pt-pinned-commit"
 
         .ci/scripts/setup-arm-baremetal-tools.sh
 
@@ -180,7 +180,7 @@ jobs:
         conda activate "${CONDA_ENV}"
 
         source .ci/scripts/utils.sh
-        install_executorch "use-pt-pinned-commit"
+        install_executorch "--use-pt-pinned-commit"
 
         .ci/scripts/setup-arm-baremetal-tools.sh