[CT-2913] Run unit tests in packages that are not the root package

[gshank]

Description

If we want to handle running unit tests in packages that are not the root package, we need to make a few changes in the unit testing code.

• Construct a unique_id that uses the non-root package name
• Set the package name in the constructed UnitTestNode

Acceptance Criteria

Non-root package unit tests are executed if selected.

Impact to Other Teams

None

Will backports be required?

No

Context

[graciegoheen]

Notes from estimation:

• right now we're assuming it's just in the root package in the parsing code
• make sure the package of the unit test is included in the unit test node
• do we actually want these disabled by default? you can't change the logic in a package... or provide a simple way to not select them? even if we don't do this, it should be an intentional choice
• we will want to put tests on this

[MichelleArk]

Resolved by: #9184