Refactor package_outputs

Refactor package_outputs in the TestOptimizer so it just returns a list
of soong_zip commands to be run by build_test_suites.

Since we already have a tested implementation for running subprocesses
in build_test_suites.py there's no reason to reimplement it in
optimized_targets.py. Because any packaging will ultimately use
soong_zip to package its final outputs change the code to just do
whatever prep it needs to and return a list of soong_zip commands.

This way the code is simpler to test without requiring subprocesses and
no reimplementation of subprocess running code is necessary.

Test: atest build_test_suites_test; atest optimized_targets_test
Bug: 358215235
Change-Id: I3025aefeeb7186f537266a72d8422211ca9835ba

ci/optimized_targets.py

@@ -52,14 +52,17 @@ class OptimizedBuildTarget(ABC):
     self.modules_to_build = {self.target}
     return {self.target}
 
-  def package_outputs(self):
+  def get_package_outputs_commands(self) -> list[list[str]]:
     features = self.build_context.enabled_build_features
     if self.get_enabled_flag() in features:
-      return self.package_outputs_impl()
+      return self.get_package_outputs_commands_impl()
 
-  def package_outputs_impl(self):
+    return []
+
+  def get_package_outputs_commands_impl(self) -> list[list[str]]:
     raise NotImplementedError(
-        f'package_outputs_impl not implemented in {type(self).__name__}'
+        'get_package_outputs_commands_impl not implemented in'
+        f' {type(self).__name__}'
     )
 
   def get_enabled_flag(self):
@@ -86,8 +89,8 @@ class NullOptimizer(OptimizedBuildTarget):
   def get_build_targets(self):
     return {self.target}
 
-  def package_outputs(self):
-    pass
+  def get_package_outputs_commands(self):
+    return []
 
 
 class ChangeInfo:
@@ -114,6 +117,7 @@ class ChangeInfo:
 
     return changed_files
 
+
 class GeneralTestsOptimizer(OptimizedBuildTarget):
   """general-tests optimizer