Inject @InjectComponentManager fields early in XWiki's JUnit5 Mockito extension

Right now the order in MockitoComponentManagerExtension is:

• create empty CM
• inject @MockComponent fields
• handle @BeforeComponent methods
• fill the CM with @AllComponent and @ComponentList annotations
• handle @AfterComponent methods
• inject @InjectMockComponents fields
• inject @InjectComponentManager fields

This is preventing access to @InjectComponentManager fields if you need them in @BeforeComponent methods.