Handle assume(false) correctly

[mzuehlke]

assume(false) gets now handled in the same way as test("description".ignore"). Added tests to cover both ways to skip tests.

Fixes #614

---

This change leads to the following change in reporting (taken from SkippedFrameworkSuite):

now:

==> success munit.SkippedFrameworkSuite.pass
==> ignored munit.SkippedFrameworkSuite.ignore
==> success munit.SkippedFrameworkSuite.assume(true)
==> skipped munit.SkippedFrameworkSuite.assume(false) - assume it fails

change JVM

 ==> success munit.SkippedFrameworkSuite.pass
-==> skipped munit.SkippedFrameworkSuite.ignore
+==> ignored munit.SkippedFrameworkSuite.ignore
 ==> success munit.SkippedFrameworkSuite.assume(true)
-==> success munit.SkippedFrameworkSuite.assume(false)
+==> skipped munit.SkippedFrameworkSuite.assume(false) - assume it fails

change JS

 ==> success munit.SkippedFrameworkSuite.pass
 ==> ignored munit.SkippedFrameworkSuite.ignore
 ==> success munit.SkippedFrameworkSuite.assume(true)
-==> success munit.SkippedFrameworkSuite.assume(false)
+==> skipped munit.SkippedFrameworkSuite.assume(false) - assume it fails

change native

 ==> success munit.SkippedFrameworkSuite.pass
 ==> ignored munit.SkippedFrameworkSuite.ignore
 ==> success munit.SkippedFrameworkSuite.assume(true)
-==> success munit.SkippedFrameworkSuite.assume(false)
+==> skipped munit.SkippedFrameworkSuite.assume(false) - assume it fails

[tgodzik]

Looks like js and native tests are failing, could you take a look? Seems like they're ignored rather than skipped

[mzuehlke]

The result for all the platforms was different. JS was correct and both native and JVM had some issues.
Now they are all identical

[olafurpg]

LGTM 👍🏻 Thank you for this contribution!