testing: add repository argument (#1620)
testing: add repository argument (#1620)

Description: Similar to some other envoy rules add a way to specify a repository when invoking `envoy_mobile_swift_test` rule. This is needed for cases when `envoy_mobile_swift_test` is invoked from outside of `envoy_mobile`.
Risk Level: Low (testing only, additive)
Testing: Manual
Docs Changes: None
Release Notes: None

Signed-off-by: Rafal Augustyniak <c112854348d0b65cbb3818b4bb8eb5588417f7f1@lyft.com>
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile