Update GCC (in doc and docker) to GCC12#1512

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JF002 wants to merge 3 commits intomainfrom

update-to-gcc12

Commits on Jan 4, 2023

Update GCC (in doc and docker) to GCC12 (Arm GNU Toolchain Version 12.2.Rel1 Released: December 22, 2022, https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads).+
JF002
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Update GCC version in VSCode launch configuration, buildAndProgram.md and buildWithVScode.md.
JF002
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Docker build script : use $GCC_ARM_PATH in wget command that downloads GCC to avoid code duplication.
JF002
committed