refactor: use shared mocks for tests

go/go.mod

@@ -5,6 +5,7 @@ go 1.25.0
 require (
 	cloud.google.com/go/firestore v1.21.0
 	cloud.google.com/go/storage v1.59.1
+	firebase.google.com/go/v4 v4.19.0
 	github.com/deepgram/deepgram-go-sdk/v3 v3.5.0
 	github.com/golang-migrate/migrate/v4 v4.19.1
 	github.com/google/uuid v1.6.0
@@ -19,6 +20,7 @@ require (
 	github.com/testcontainers/testcontainers-go/modules/postgres v0.40.0
 	go.jetify.com/typeid v1.3.0
 	go.uber.org/mock v0.6.0
+	google.golang.org/api v0.256.0
 	google.golang.org/grpc v1.79.1
 	google.golang.org/protobuf v1.36.11
 	nhooyr.io/websocket v1.8.17
@@ -37,7 +39,6 @@ require (
 	cloud.google.com/go/longrunning v0.7.0 // indirect
 	cloud.google.com/go/monitoring v1.24.2 // indirect
 	dario.cat/mergo v1.0.2 // indirect
-	firebase.google.com/go/v4 v4.19.0 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c // indirect
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.30.0 // indirect
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.54.0 // indirect
@@ -176,7 +177,6 @@ require (
 	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/text v0.34.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
-	google.golang.org/api v0.256.0 // indirect
 	google.golang.org/appengine/v2 v2.0.6 // indirect
 	google.golang.org/genproto v0.0.0-20250922171735-9219d122eba9 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57 // indirect