Prior to this commit, if a ResourcePatternHint was created with a
resource pattern with a leading slash, the hint was registered and
eventually converted to configuration for the GraalVM native image
compiler.
However, such a resource pattern is invalid for GraalVM. Consequently,
the registered resources were not available within the compiled native
image.
This commit ensures that registered patterns are applicable in a native
image by preventing creation of a ResourcePatternHint with a pattern
with a leading slash.
Closes gh-29088
10ade235e3