revert: stop using conf.d directory for generated-optimizations #5934

Job	Run time
nix-eval / eval	3m 44s
no packages to build (x86_64-linux)	2s
no packages to build (aarch64-darwin)	2s
no packages to build (aarch64-linux)	5s
pre-commit-run (x86_64-linux)	44s
treefmt-check (x86_64-linux)	36s
pre-commit-run (aarch64-darwin)	17s
treefmt-check (aarch64-darwin)	17s
treefmt-check (aarch64-linux)	1m 11s
pre-commit-run (aarch64-linux)	1m 30s
run-tests / prepare	37s
run-testinfra / prepare	35s
docker-image-test / Check Docker Image Changes	55s
run-testinfra / test-ami-nix (15)	53m 30s
run-testinfra / test-ami-nix (17)	52m 10s
run-testinfra / test-ami-nix (orioledb-17)	54m 37s
run-tests / build (17)	3m 42s
run-tests / build (15)	3m 58s
run-tests / build (orioledb-17)	3m 46s
docker-image-test / Docker Image Test (Skipped)	3s
docker-image-test / Test ${{ matrix.name }}	0s
	3h 2m 21s

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