fix(angular): directory type is not optional (#30354)

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## Current Behavior
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The `directory` option for the ngrx feature store generator is currently
marked as optional. With that, if you try to run the generator and do
not pass a directory, it will throw an error.


## Expected Behavior
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`directory` needs to be a required option. The Nx Console already
handles this by pre-populating the option, this just adjusts things
appropriately for those not using the console, or calling the generator
programatically.

## Related Issue(s)
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merged. -->

Fixes #

Author: mhartington

packages/angular/src/generators/ngrx-feature-store/schema.d.ts

@@ -2,7 +2,7 @@ export interface Schema {
   name: string;
   minimal: boolean;
   parent: string;
-  directory?: string;
+  directory: string;
   route?: string;
   barrels?: boolean;
   facade?: boolean;