[cmd/mdatagen] Move component config test from cmd/builder #9940
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The tests generated by cmd/builder are skipped in contrib because they cause the CI timeouts. We moved the lifecycle tests to the tests generated by mdatagen, but the config/factory smoke tests are still part of the files generated by cmd/builder.
Recently, the loadbalancing exporter got an invalid camelCase config field because of this coverage gap.
This change moves the config/factory tests from cmd/builder to cmd/mdatagen. So, they are always generated for every component, even if not used in any collector bundle.