Make graphql-c_parser optional with warning when unavailable #3106

Job	Run time
lint-workflows	13s
docker-demo	2m 59s
ci-check (run_each_gem_spec, 4.0, elasticsearch:9.2.4)	18m 34s
ci-check (run_each_gem_spec, 3.4, elasticsearch:9.2.4)	18m 17s
ci-check (run_datastore_specs, 4.0, opensearch:3.4.0)	4m 37s
ci-check (run_datastore_specs, 4.0, opensearch:2.19.0)	4m 9s
ci-check (run_datastore_specs, 4.0, elasticsearch:9.0.0)	4m 26s
ci-check (run_specs_with_vcr, 4.0, elasticsearch:9.2.4)	10m 10s
ci-check (run_misc_checks, 4.0, elasticsearch:9.2.4)	12m 15s
ci-check (run_specs_file_by_file, 4.0, elasticsearch:9.2.4)	21m 10s
All CI Checks Passed	10s
	1h 37m 0s

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