Add tests

Author: mx-psi

extension/extensionauth/extensionauthtest/go.mod

@@ -10,7 +10,9 @@ require (
 )
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	go.opentelemetry.io/collector/component v1.27.0 // indirect
 	go.opentelemetry.io/collector/extension v1.27.0 // indirect
 	go.opentelemetry.io/collector/pdata v1.27.0 // indirect
@@ -24,6 +26,7 @@ require (
 	golang.org/x/text v0.21.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f // indirect
 	google.golang.org/protobuf v1.36.5 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 replace go.opentelemetry.io/collector/extension/extensionauth => ..