[PM-16262] Make getEnvironment observable and use it in SdkService (#12501)

* feat: re-implement getEnvironment as an observable

* feat: deprecate `getEnvironment`

* fix: use correct environment function in SdkService

* fix: test

libs/common/src/platform/abstractions/environment.service.ts

@@ -128,5 +128,10 @@ export abstract class EnvironmentService {
   /**
    * Get the environment from state. Useful if you need to get the environment for another user.
    */
+  abstract getEnvironment$(userId?: string): Observable<Environment | undefined>;
+
+  /**
+   * @deprecated Use {@link getEnvironment$} instead.
+   */
   abstract getEnvironment(userId?: string): Promise<Environment | undefined>;
 }