fix: gracefully handle missing proto/src directories in ProtobufNoCheckInHeaderProcessor - #855
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This PR adds a safety check to ProtobufNoCheckInHeaderProcessor to ensure the proto/src directory actually exists before attempting to traverse it. Previously, if a library did not contain a proto/src directory (which is common for certain Google Cloud packages like accessapproval), the post-processor would crash with a fatal error: Uncaught UnexpectedValueException: RecursiveDirectoryIterator::__construct(././proto/src): Failed to open directory.
Fixes googleapis/librarian#7260