Use a unique key to sign our test apps.

This ensures it is not the same as the platform key, even on test-keys
builds, which causes permission tests to fail.

While I'm here, delete test.keystore, which has been unused since
aosp/1972343.

Bug: 290582742
Test: atest MicrodroidTests
Change-Id: I9477f50a4d7cf778477893f49ff2b7a0d9a4b7e2
diff --git a/tests/testapk/microdroid_test_app.x509.pem b/tests/testapk/microdroid_test_app.x509.pem
new file mode 100644
index 0000000..9a0309c
--- /dev/null
+++ b/tests/testapk/microdroid_test_app.x509.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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+qFbeenHjFoMJN9HIAZaz4OqzgGfhfMf596rn+HPAJnRMtsI=
+-----END CERTIFICATE-----