tests: increase timeouts throughout to fix flaky tests & fix tests on ARM
- remote_trust_store_test: reduce the possibility of DBus timeout
- remote_trust_store_test: increase client-server wait time to 2000ms
- dbus_test: increase DBus fixture timeout tremendously
- Revert "Temporarily allow tests to fail on arm due to slow CI"
Edited by Ratchanan Srirattanamet