Update browser and tor-android-service projects to pull data from pt_config.json

Added pt_config.json in #40739 (closed) should be consumed in:

• browser -: ClientTransportPlugin strings, builtin bridge strings, and default preferred bridge pref can now be pulled from pt_config.json
• tor-android-service : builtin bridge strings can now be pulled from pt_config.json
• tor-onion-proxy-library : ClientTransportPlugin strings should now be pulled from pt_config.json
  • richard: yeah maybe not, this is not really maintainable and is going away with arti anyway so let's just leave this as is

Once these are migrated we can remove the the bridge string lines from tor-browser-build/common (assuming they are not depended on by anything by anti-censorship.

/cc @meskio