Prior to this commit, the ManagementErrorEndpoint used to handle error
responses for the management servlet excluded stacktrace and exception
message details from the response unconditionally.
With this commit, the endpoint honors the
`server.error.include-stacktrace` and `server.error.include-details`
properties to conditionally include error details for consistency
with non-management error handling.
Fixes gh-20989
f4c2714139