Document IgnoreCliErrors

[bruno-garcia]

We got a contributor feature:

• feat: add a flag whether to ignore the CLI errors during Android symbol upload #1687

This looks like it should have been setting an env var instead?
See: getsentry/sentry-docs#11318

Is this feature/option documented?
It must be clear that symbols need to be saved and uploaded at a later point. Or crashes won't symbolicate.

[bitsandfoxes]

Instead of just documenting, extending the opt-out to other platforms and make it use the env flag instead of our own workaround.