When there is an existing value, deducing the bind method may
incorrectly result in the use of constructor binding. This
results in a failure in the configuration properties
post-processor as it refuses to bind properties to a bean whose
attributes indicate that constructor binding should have been used.
This commit updates ConfigurationPropertiesBean to avoid tryin to
deduce the bind method and instead use the presence or absence of an
existing value to determine the type of binding that should be used.
Only when there is no existing value is constructor binding
appropriate.
Fixes gh-36175
090802b11b