simpleperf: Detect test environment before running tests

Some tests are sensitive to delays detecting test environment.
So do it before running tests.

Bug: 343174590
Test: run CtsSimpleperfTestCases --gtest_filter=record_cmd.stop_when_no_more_targets
Change-Id: Id0e4a5072fa855ca51748020d01d98d4748bb724
(cherry picked from commit 7a01345d3a67782dd56b8aab9d231de587a37de5)
1 file changed