refactor(core): rename ngComponentDef to ɵcmp (#33088)

Component defs are not considered public API, so the property
that contains them should be prefixed with Angular's marker
for "private" ('ɵ') to discourage apps from relying on def
APIs directly.

This commit adds the prefix and shortens the name from
`ngComponentDef` to `cmp`. This is because property names
cannot be minified by Uglify without turning on property
mangling (which most apps have turned off) and are thus
size-sensitive.

Note that the other "defs" (ngDirectiveDef, etc) will be
prefixed and shortened in follow-up PRs, in an attempt to
limit how large and conflict-y this change is.

PR Close #33088

packages/compiler-cli/src/ngtsc/scope/src/local.ts

@@ -91,7 +91,7 @@ export class LocalModuleScopeRegistry implements MetadataRegistry, ComponentScop
    * Tracks whether a given component requires "remote scoping".
    *
    * Remote scoping is when the set of directives which apply to a given component is set in the
-   * NgModule's file instead of directly on the ngComponentDef (which is sometimes needed to get
+   * NgModule's file instead of directly on the component def (which is sometimes needed to get
    * around cyclic import issues). This is not used in calculation of `LocalModuleScope`s, but is
    * tracked here for convenience.
    */