Fix DynamicLayoutComponent Initialization for Remote Environment Configurations and Remove Non-Null Assertion

[SecTex]

Description

This pull request addresses an issue where applications that dynamically resolve their environment configuration via removeEnv encounter a runtime error: Cannot read properties of undefined (reading 'responseType'). It also removes a non-null assertion from inject(DynamicLayoutComponent, { optional: true, skipSelf: true }), due to it being optional.

1. Replaces the OnInit lifecycle hook with an environment change listener.
2. Ensures getLayout() is triggered only when the oAuthConfig is available and its responseType is code, preventing access to undefined properties
3. Ensures getLayout() is triggered only when layout is not initialized, preventing re-initialization of the layout.

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)