refactor(core): rename `instructions/container.ts` -> `instructions/template.ts` (#34715)

Prior to this change, the `template` instruction logic was located in the `instructions/container.ts` file alongside embedded view instructions. Since unused embedded view instructions are removed in a previous commit, this commit renames `container.ts` -> `template.ts`, since only template-related instructions were retained.

PR Close #34715

packages/core/src/render3/instructions/all.ts

@@ -28,7 +28,7 @@
 export * from './attribute';
 export * from './attribute_interpolation';
 export * from './change_detection';
-export * from './container';
+export * from './template';
 export * from './storage';
 export * from './di';
 export * from './element';