[release/6.0] Testing: add some force unwraps for Android

[hyp]

Add some force unwraps to address nullability differences on Android from other platforms.

(cherry picked from commit d080ee2ff59e4a66109e9823aa91ca67b8dca7e7)

Motivation:

This is needed to build the release/6.0 branch of testing for Android.

Modifications:

Add force unwraps where they were needed.

Result:

Android swift-testing builds on the release/6.0 branch.

Checklist:

• [x] Code and documentation should follow the style of the Style Guide.
• [x] If public symbols are renamed or modified, DocC references should be updated.

[grynspan]

Needs approval from @briancroom before merging.

[grynspan]

You are free to merge (ping me if you don't see the Big Green Button!)