Improve CI NDK install by using nttld/setup-ndk

[mikehardy]

Currently we have an install_ndk.bat script here and an install_ndk.sh script for *nix
There is a community action though, and we should just use that

https://github.com/nttld/setup-ndk

Originally posted by @mikehardy in #402 (comment)

[mikehardy]

There was a flake just now which added some requirements, that is:

• the install NDK should probably be wrapped in a retry if possible? (though community action may not support it) because network failures happen and this is a big network resource fetch
• it cannot silently succeed if there is a failure

Failure seen in current script was:

Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Still waiting for package manifests to be fetched remotely.
Warning: Errors during XML parse:
Warning: Additionally, the fallback loader failed to parse the XML.
Warning: An error occurred while preparing SDK package NDK (Side by side) 27.0.1[20](https://github.com/ankidroid/Anki-Android-Backend/actions/runs/11296483641/job/31421447527?pr=423#step:7:21)77973: Archive is not a ZIP archive.

...but it silently proceeded and then later on failed during a build step where the NDK was needed