Fix YAML reference error and better handle rename

[citizenmatt]

Fixes two issues:

• RIDER-27053 - unable to rename MonoBehaviour derived class
• RIDER-27009 - errors reported when referencing scripts or event handlers from read only/referenced packages. Note that this "fix" simply disables the error being reported. We need to better handle this in the future, but that will be tricky as the backend doesn't know about where these package files are (Library/PackageCache) and can't easily map back from an asset guid to a classname.