Fix and improve errors when the entry fns cannot be generated #18855

Job	Run time
build-reference-examples	4m 27s
build-sway-examples	3m 34s
build-sway-lib-core	4m 1s
build-sway-lib-std	4m 13s
forc-fmt-check-sway-lib-core	4m 1s
forc-fmt-check-sway-lib-std	3m 47s
build-mdbook	8m 23s
get-fuel-core-version	49s
forc-fmt-check-panic	1m 50s
forc-fmt-check-sway-examples	1m 1s
build-forc-test-project	10m 45s
build-forc-doc-sway-lib-std	5m 30s
cargo-build-workspace	3m 36s
cargo-clippy	4m 39s
cargo-fmt-check	13s
cargo-toml-fmt-check	29s
cargo-run-e2e-test-evm	9m 12s
cargo-run-e2e-test-midenvm	2m 38s
cargo-test-lib-std	2m 33s
forc-pkg-fuels-deps-check	15s
forc-run-benchmarks	5m 34s
cargo-test-workspace	14m 4s
forc-unit-tests	3m 40s
cargo-test-sway-lsp	10m 29s
cargo-unused-deps-check	4m 27s
pre-publish-check	0s
cargo-test-forc-debug	4m 15s
cargo-run-e2e-test-release	24m 52s
cargo-run-e2e-test	21m 12s
notify-slack-on-failure	2s
build-publish-master-image	0s
publish	0s
build-publish-release-image	0s
Build and upload forc binaries to release	0s
	2h 44m 31s

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