VPN-5697 - Allow account deletion on Android

[mcleinman]

Description

This was already implemented on iOS, so this was essentially just turning on the feature for Android. However, there were also some requests to improve the formatting and colors and spacing, so that is the bulk of this PR.

• The formatting changes: Better spacing, more consistent font sizes, blue button color for the "Cancel" button.
• Hiding elements w/ no content is to remove the additional spacing they were providing.
• The addition to android.cmake (${Qt6_DIR}/../../libQt6Svg_${ANDROID_ABI}.so) is due to a note a few lines above what I added (along with a build error I experienced): android-deploy-qt is bad and randomly decides to not deploy some lib's we are linking to. So as long as qt is behaving bad, let's force the deployment. Feel free to add libs that are breaking on your build locally.

Mocks: https://www.figma.com/file/CIelhzmFVyDqn6gNvMXolc/Subscription-Management-In-App?type=design&node-id=2375-1618&mode=design&t=xmGujHUgHm1ldZDW-0

Before (cut off the red Cancel button, sorry)

After

Reference

https://mozilla-hub.atlassian.net/browse/VPN-5697

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed