feat: add upgrade command to auto update fuelup, switch to latest and update installed channels #1961

Job	Run time
cancel-previous-runs	2s
check-scripts	11s
cargo-clippy	46s
cargo-fmt-check	5s
cargo-test-workspace	2m 18s
lint-toml-files	25s
Try fuelup installation with fuelup-init (ubuntu-latest)	17s
build fuelup release binaries	0s
Try fuelup installation with fuelup-init (macos-latest)	23s
Do post-release checks	0s
publish-check	0s
	4m 27s

Provide feedback