Improve document symbol hierarchy to match rust-analyzer layout #22594

Job	Run time
get-fuel-core-version	28s
build-sway-lib-std	53s
build-sway-examples	1m 6s
build-reference-examples	1m 1s
forc-fmt-check-sway-lib-core	53s
build-sway-lib-core	1m 2s
build-forc-test-project	8m 31s
build-forc-doc-sway-lib-std	1m 48s
build-mdbook	5m 15s
check-sdk-harness-test-suite-compatibility	31s
forc-fmt-check-panic	1m 55s
forc-fmt-check-sway-examples	48s
forc-fmt-check-sway-lib-std	53s
cargo-build-workspace	1m 48s
cargo-clippy	48s
cargo-fmt-check	15s
cargo-run-e2e-test-evm	3m 52s
cargo-test-forc	2m 9s
cargo-test-lib-std	16m 16s
cargo-test-sway-lsp	7m 49s
cargo-test-workspace	3m 14s
cargo-toml-fmt-check	16s
cargo-unused-deps-check	2m 27s
forc-pkg-fuels-deps-check	16s
forc-run-benchmarks	2m 17s
forc-unit-tests	2m 11s
pre-publish-check	0s
cargo-test-forc-debug	1m 57s
cargo-test-forc-client	2m 38s
cargo-run-e2e-test	10m 24s
cargo-run-e2e-test-release	12m 36s
notify-slack-on-failure	2s
publish	0s
build-publish-master-image	0s
build-publish-release-image	0s
Build and upload forc binaries to release	0s
verifications-complete	0s
	1h 36m 19s

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