Prior to this commit, @TestConstructor supported a boolean `autowire`
attribute which naturally limited the configuration to two states: on
or off. Since we may need to support additional autowiring modes in the
future, the use of a boolean is limiting.
This commit address this issue by introducing a new AutowireMode enum
in @TestConstructor with ALL and ANNOTATED constants. In addition, the
attribute has been renamed to `autowireMode`, and the system property
has been renamed to `spring.test.constructor.autowire.mode` for greater
clarity of purpose.
Closes gh-23224
fc38bb4fc6