Remove InApexModules

The only use of InApexModules was a container check that verified that
apexes didn't depend on non-stubs modules from outside the apex.  Switch
it to InApexVariants for now, although that will also need to be removed.

Bug: 372543712
Test: builds
Change-Id: I822e982e3e8767dc251c8341de9f40373982c6ed
diff --git a/android/container.go b/android/container.go
index 2a3777b..775436a 100644
--- a/android/container.go
+++ b/android/container.go
@@ -382,7 +382,7 @@
 
 func (c *ContainersInfo) ApexNames() (ret []string) {
 	for _, apex := range c.belongingApexes {
-		ret = append(ret, apex.InApexModules...)
+		ret = append(ret, apex.InApexVariants...)
 	}
 	slices.Sort(ret)
 	return ret