ansible: update RHEL 8 cross compiler container

[richardlau]

Update RHEL 8 container used for cross compiling for armv7.
Add logic to select gcc 10 toolchain for Node.js 20 onwards.
Install gcc-toolset-10 host compiler.

Refs: rvagg/rpi-newer-crosstools#2
Refs: https://github.com/orgs/nodejs/discussions/45892
Refs: nodejs/node#47067

[richardlau]

The containers have been updated. The iojs+release and node-cross-compile jobs won't use gcc 10 until they are updated to add the cross-compiler-rhel8-armv7-gcc-10-glibc-2.28 label and the VersionSelectorScript.groovy changes merged.

I copied some of the arm-fanned job so I could pick up the version selector change.
Test build with the copied job: https://ci.nodejs.org/job/richardlau-node-test-commit-arm-fanned/4/

[richardlau]

I copied some of the arm-fanned job so I could pick up the version selector change. Test build with the copied job: https://ci.nodejs.org/job/richardlau-node-test-commit-arm-fanned/4/

Tests failed on Debian 10 (expected, see notes in rvagg/rpi-newer-crosstools#2).
Tests passed on Ubuntu 20.04 🎉. I've copied the node-test-binary-armv7l job and modified it to use the VersionSelectorScript.groovy from this PR (which should cause debian10 to be skipped for Node.js 20).

New test CI: https://ci.nodejs.org/job/richardlau-node-test-commit-arm-fanned/8/

[MoLow]

LGTM

[mhdawson]

LGTM