chore: angular 15 and nx 15 support (#9078)

**BREAKING CHANGE:**

* Updated @angular library to v15;
* Updated nx library to v15;
* Updated other third-party libraries to latest version;
* Applied necessary migrations;
* Adjusted unit tests;
* For projects without unit tests angular failed karma execution with error that no tests were found, so filler test (dummy) was added to such projects;
* Build target now ES2022
* `RouterLinkWithHref` is now deprecated and removed from `@fundamental-ngx/core/link`.
* Value help dialog data provider generic type should be extended from object.

**Before**:
```typescript
class ExampleVhdDataProvider<T> extends VhdDataProvider<T> {
    fetch(params: Map<string, string>): Observable<T[]> {
        return super.fetch(params).pipe(delay(300));
    }
}
```
**Now:**
```typescript
class ExampleVhdDataProvider<T extends object> extends VhdDataProvider<T> {
    fetch(params: Map<string, string>): Observable<T[]> {
        return super.fetch(params).pipe(delay(300));
    }
}
```