Generate less code in the compiled model

• Leverage defaults (in particular, for provider-specific configuration)
• Don't emit exceptions (like ComplexCollectionNullElementSetter) when detailed errors are not enabled
• Use visitors to find the referenced metadata objects in the generated lambdas and don't output code for the unused ones. See f0e88d40a4ec337c9ecf5225659c630c27a79dc7
  • Or inline them (see #34442)

Related: #31370