Cleanup BUCK files from template - Part 2 (#35020)

Summary:
The `template/android/app/build_defs.bzl` file can be removed as it's unused in the Template.

## Changelog

[Internal] - Remove build_defs.bzl from Android Template

Pull Request resolved: https://github.com/facebook/react-native/pull/35020

Test Plan: n/a

Reviewed By: cipolleschi

Differential Revision: D40506250

Pulled By: cortinico

fbshipit-source-id: 14d8522a995a4b19b5b6610fcb2c5b1dda3374c8

template/android/app/build_defs.bzl

@@ -1,19 +0,0 @@
-"""Helper definitions to glob .aar and .jar targets"""
-
-def create_aar_targets(aarfiles):
-    for aarfile in aarfiles:
-        name = "aars__" + aarfile[aarfile.rindex("/") + 1:aarfile.rindex(".aar")]
-        lib_deps.append(":" + name)
-        android_prebuilt_aar(
-            name = name,
-            aar = aarfile,
-        )
-
-def create_jar_targets(jarfiles):
-    for jarfile in jarfiles:
-        name = "jars__" + jarfile[jarfile.rindex("/") + 1:jarfile.rindex(".jar")]
-        lib_deps.append(":" + name)
-        prebuilt_jar(
-            name = name,
-            binary_jar = jarfile,
-        )