chore: remove noRxjsPatchImportsRule (#10765)

Author: rafaelss95

CODING_STANDARDS.md

@@ -126,21 +126,6 @@ class ConfigBuilder {
 }
 ```
 
-#### RxJS
-When dealing with RxJS operators, import the pipeable operator (e.g.
-`import {map} from 'rxjs/operators/map'`), as opposed to using the "patch" imports which pollute the
-user's global Observable object (e.g. `import 'rxjs/add/operator/map'`):
-
-```ts
-// NO
-import 'rxjs/add/operator/map';
-someObservable.map(...).subscribe(...);
-
-// YES
-import {map} from 'rxjs/operators/map';
-someObservable.pipe(map(...)).subscribe(...);
-```
-
 #### Access modifiers
 * Omit the `public` keyword as it is the default behavior.
 * Use `private` when appropriate and possible, prefixing the name with an underscore.

tools/tslint-rules/noRxjsPatchImportsRule.ts

@@ -109,10 +109,6 @@
       true,
       "src/+(lib|cdk|material-experimental|cdk-experimental|demo-app)/**/!(*.spec).ts"
     ],
-    "no-rxjs-patch-imports": [
-      true,
-      "src/+(lib|cdk|material-experimental|cdk-experimental)/**/*.ts"
-    ],
     "missing-rollup-globals": [
       true,
       "./tools/package-tools/rollup-globals.ts",