Replace unmaintained generational-arena with slotmap #18098

Job	Run time
build-sway-examples	1m 50s
build-sway-lib-std	1m 10s
get-fuel-core-version	48s
build-reference-examples	1m 18s
build-sway-lib-core	1m 6s
forc-fmt-check-sway-lib-core	56s
build-forc-doc-sway-lib-std	2m 5s
build-mdbook	4m 54s
forc-fmt-check-panic	1m 35s
forc-fmt-check-sway-examples	55s
forc-fmt-check-sway-lib-std	1m 0s
build-forc-test-project	5m 8s
cargo-build-workspace	3m 21s
cargo-clippy	1m 2s
cargo-fmt-check	13s
cargo-toml-fmt-check	12s
cargo-run-e2e-test-evm	2m 25s
cargo-run-e2e-test-midenvm	2m 36s
cargo-test-lib-std	5m 33s
cargo-test-workspace	6m 58s
forc-pkg-fuels-deps-check	16s
forc-run-benchmarks	3m 23s
forc-unit-tests	2m 50s
cargo-unused-deps-check	4m 6s
pre-publish-check	0s
cargo-run-e2e-test	23m 3s
cargo-run-e2e-test-release	22m 58s
cargo-test-forc-debug	45s
notify-slack-on-failure	1s
build-publish-master-image	0s
publish	0s
build-publish-release-image	0s
Build and upload forc binaries to release	0s
	1h 42m 27s

Provide feedback