
A change [1] in Spring Framework 5.3 means that getUrl() on a
RequestEntity will throw an UnsupportedOperationException if the
entity was created using a template.
This commit updates TestRestTemplate to check for instances of
UriTemplateRequestEntity and to resolve the URI using the
entity's UriTemplateHandler instead of calling getUrl() directly.
Fixes gh-25097
[1] a0f4d81db7