Add integration test for EnforcePermissionHelperDetector

This test ensures that the linter is correctly executed and reports an
error. It uses the `lint.suppress_exit_code` to silence the error when
building the test library (otherwise, this module would fail to build on
a checkbuild).

Bug: 302400088
Test: atest --host AndroidGlobalLintCheckerIntegrationTest
Change-Id: Ib9e9deec16f6b703139fb85337f4a826a99ec033