Convert Spring `@⁠Inject` TCK tests from JUnit 3 to JUnit Jupiter

[sbrannen]

Overview

In preparation for upgrading to JUnit 6 with its "deprecation" of the the JUnit Vintage test engine, we should finally convert SpringAtInjectTckTests to the JUnit Jupiter programming model, even though we'll internally have to adapt from a JUnit 3 TestCase and TestSuite to JUnit Jupiter constructs.

Doing so will also allow us to remove the dependency on junit-vintage-engine in spring-context.

Related Issues

• Test against JUnit 6 #35124