Support proto2 syntax and custom proto file headers #5106

Job	Run time
docker-demo	2m 50s
ci-check (run_specs_with_vcr, 4.0, elasticsearch:9.4.2)	14m 5s
ci-check (run_specs_file_by_file, 4.0, elasticsearch:9.4.2)	19m 24s
lint-workflows	14s
ci-check (run_specs_for_jruby, jruby-10.0, elasticsearch:9.4.2, 4)	21m 9s
ci-check (run_specs_for_jruby, jruby-10.0, elasticsearch:9.4.2, 1)	22m 30s
ci-check (run_datastore_specs, 4.0, elasticsearch:9.0.0)	6m 12s
ci-check (run_datastore_specs, 4.0, opensearch:2.19.0)	5m 35s
ci-check (run_specs_for_jruby, jruby-10.0, elasticsearch:9.4.2, 3)	16m 12s
ci-check (run_specs_for_jruby, jruby-10.0, elasticsearch:9.4.2, 2)	8m 19s
ci-check (run_each_gem_spec, 4.0, elasticsearch:9.4.2)	23m 10s
ci-check (run_each_gem_spec, 3.4, elasticsearch:9.4.2)	23m 11s
ci-check (run_misc_checks, 4.0, elasticsearch:9.4.2)	16m 7s
ci-check (run_datastore_specs, 4.0, opensearch:3.6.0)	6m 47s
All CI Checks Passed	11s
	3h 5m 56s

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