When resolveInboundMTLSProfileForRoute fails for the global profile, emit a
zerolog error and continue without applying that pool. Apply inbound mTLS from
the global profile only when err is nil and pool is non-nil.
Add yaml struct tags to InboundMTLSProfile alongside json for YAML config
loading.
Clarify no-op stub methods in inbound_mtls_validation_test with comments.