Analytics configuration is the responsibility of the host application when running in widget mode (#3089)

* Support for analytics configuration via URL parameters in widget mode

Adds:

- posthogApiHost
- posthogApiKey
- rageshakeSubmitUrl
- sentryDsn
- sentryEnvironment

Deprecate analyticsId and use posthogUserId instead

* Partial test coverage

* Simplify tests

* More tests

* Lint

* Split embedded only parameters into own section for clarity

* Update docs/url-params.md

* Update docs/url-params.md

* Update vite.config.js

src/utils/test.ts

@@ -264,6 +264,8 @@ export function mockConfig(config: Partial<ResolvedConfigOptions> = {}): void {
     ...DEFAULT_CONFIG,
     ...config,
   });
+  // simulate loading the config
+  vi.spyOn(Config, "init").mockResolvedValue(void 0);
 }
 
 export class MockRTCSession extends TypedEventEmitter<