Remove support for generating versioned snapshots

Previously, the code for selecting specific versions of sdk snapshots
was removed (along with the uses_sdks property). That makes versioned
snapshots useless so this change removes all the code and tests that
generated those versioned snapshots.

Bug: 232546567
Test: m nothing
      packages/modules/common/build/mainline_modules_sdks.sh
Change-Id: Ib6d1b72bc8399fbb39075494ae37da92f4b28d03
diff --git a/sdk/exports.go b/sdk/exports.go
index 9a0ba4e..7645d3f 100644
--- a/sdk/exports.go
+++ b/sdk/exports.go
@@ -31,7 +31,7 @@
 	return newSdkModule(true)
 }
 
-// module_exports_snapshot is a versioned snapshot of prebuilt versions of all the exports
+// module_exports_snapshot is a snapshot of prebuilt versions of all the exports
 // of a mainline module.
 func ModuleExportsSnapshotsFactory() android.Module {
 	s := newSdkModule(true)