(cherry picked from commit daa4713)

JUnit Jupiter 5.11 introduced a regression regarding extension
registration via fields. Specifically, repeated @⁠ExtendWith
annotations on composed annotations were no longer found.

This commit fixes that regression by reintroducing support for finding
@⁠ExtendWith on custom composed annotations when @⁠ExtendWith is used
as a repeatable annotation.

Fixes #4054

(cherry picked from commit d274794)

Issues: #4059 and #4063
(cherry picked from commit eba399e)

Fixes #4063.

(cherry picked from commit 4ff42a7)

Since `ArchUnitTests` is executed by the ArchUnit engine, declaring an
order did not have any effect.

(cherry picked from commit d7ab63e)

`Class.getPackage()` returns `null` for the default package on Java 8.
This is now handled by inspecting the fully qualified class name rather
than throwing a `NullPointerException`.

Fixes #4076.

Fixes #4059.

(cherry picked from commit b6546cd)