Merge #517 by 06393993: android_application: add executable bits for some shell scripts

`gen_android_feature_manifest.sh` and
`gen_priority_android_feature_manifest.sh` are both direclty used in the executable fields in `ctx.actions.run` in `_create_feature_manifest`. If they don't have the executables bit, the action fails with permission denied.

An alternative is to create `sh_binary` targets for those `*.sh` files, if we prefer that instead of modifying the file metadata, please let me know.
Closes #517

COPYBARA_INTEGRATE_REVIEW=https://github.com/bazelbuild/rules_android/pull/517 from 06393993:fix_scripts_meta 8e1b386d69513a9591e4ddc2cb46a54d30b90394
PiperOrigin-RevId: 926840020
Change-Id: I785810904c777865cd8f33715df4de6b8599cc71

rules/android_application/feature_module_validation.sh

diff --git a/rules/android_application/feature_module_validation.sh b/rules/android_application/feature_module_validation.sh
old mode 100644
new mode 100755

rules/android_application/gen_android_feature_manifest.sh

diff --git a/rules/android_application/gen_android_feature_manifest.sh b/rules/android_application/gen_android_feature_manifest.sh
old mode 100644
new mode 100755

rules/android_application/gen_priority_android_feature_manifest.sh

diff --git a/rules/android_application/gen_priority_android_feature_manifest.sh b/rules/android_application/gen_priority_android_feature_manifest.sh
old mode 100644
new mode 100755