Replace generated `include` folder with `src-gen/include` #2582

Job	Run time
check-labels / check	3s
check-diff / check	27s
building / build-toolchain (ubuntu-latest)	5m 48s
lsp / test-lsp (ubuntu-latest)	8m 26s
cli / test-cli (ubuntu-latest)	2m 56s
building / epoch / build-epoch	9m 33s
	27m 13s

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