This commit harmonizes how a candidate bean definition is determined
for overriding using `@TestBean`, `@MockitoBean`, and `@MockitoSpyBean`.
Previously, a qualifier was necessary even if the name of the annotated
field matches the name of a candidate. After this commit, such candidate
will be picked up transparently, the same it is done for regular
autowiring.
This commit also reviews the documentation of the feature as considering
the field means that its name is taken into account to compute a cache
key if by-type lookup is requested.
Closes gh-32939
28f62abda4