SI-8050 [Avian] Skip instrumented tests

Instrumentation is (currently) not supported on Avian.
This causes
- tests instrumented/InstrumentationTest.scala and
- instrumented/inline-in-constructors
to fail.

Let's skip these tests on Avian.
Merge pull request #3238 from soc/SI-8050

SI-8050 [Avian] Skip instrumented tests