Use Truth's Expect for assertions in ProfilingServiceTests

This is a no-op change refactors the tests to use the `Expect` rule
from the Truth library instead of standard JUnit assertions. This allows
for multiple assertion failures to be reported in a single test run.

Test: atest android.profiling.cts.ProfilingServiceTests
Bug: 442829650
Flag: TEST_ONLY
NO_IFTTT=Refactor using Truth's Expect. No test log changed.

Change-Id: I14dd6278629d6fb8ff62acb196c2fe446ca97040
1 file changed