Prompt user to install the override toolchain if its specified but not installed yet #2038

Job	Run time
cancel-previous-runs	4s
Check code coverage (branch)	3m 28s
cargo-clippy	2m 34s
cargo-fmt-check	7s
build fuelup release binaries	0s
check-scripts	16s
lint-toml-files	22s
cargo-test-workspace	3m 13s
Try fuelup installation with fuelup-init (ubuntu-latest)	20s
Try fuelup installation with fuelup-init (macos-latest)	22s
Do post-release checks	0s
publish-check	0s
	10m 46s

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