Add mock for OffchainClient from deployment (#15580)

* Adds mock for `OffchainClient` from `deployment`

* Updates mockery files

* Runs mockery and all dirs with a `.mockery.yaml` file

GNUmakefile

@@ -98,7 +98,7 @@ abigen: ## Build & install abigen.
 .PHONY: generate
 generate: abigen codecgen mockery protoc gomods ## Execute all go:generate commands.
 	gomods -w go generate -x ./...
-	mockery
+	find . -type f -name .mockery.yaml -execdir mockery \; ## Execute mockery for all .mockery.yaml files
 
 .PHONY: rm-mocked
 rm-mocked:

deployment/.mockery.yaml

@@ -0,0 +1,13 @@
+dir: "{{ .InterfaceDir }}/mocks"
+mockname: "{{ .InterfaceName }}"
+outpkg: mocks
+filename: "{{ .InterfaceName | snakecase }}.go"
+packages:
+  github.com/smartcontractkit/chainlink/deployment:
+    interfaces:
+      OffchainClient:
+        config:
+          mockname: "Mock{{ .InterfaceName }}"
+          filename: offchain_client_mock.go
+          inpackage: true
+          dir: "{{ .InterfaceDir }}/mocks"