Update Angular packages to version 19.2.0 and adjust version ranges

[jpsullivan]

Checklist

• Issue number for this PR: #3581
• Docs included?: no
• Test units included?: no
• In a clean directory, yarn install, yarn test run successfully? yes

Description

This PR updates the Angular dependency version ranges to support all Angular 19.x minor versions, not just 19.0.0. This resolves some dependency resolution issues where users with Angular 19.2.x projects encounter dependency conflicts when trying to use @angular/fire. To be clear, these issues were occurring on fresh Angular projects created via ng new. See https://github.com/angular/angularfire/issues/3581#issuecomment-2598435329 for more context.

I've taken the liberty of aligning the Sample project with Angular 19.2.x dependency mappings, and tested to make sure that the sample project was building without issue.