refactor: drop gotest.tools assertion and add linting rule

use testify assertions and forbid different assertion libraries

.golangci.yml

@@ -125,6 +125,10 @@ linters-settings:
               - errors
               - fmt
             reason: "This package is deprecated, use `fmt.Errorf` with `%w` instead"
+        - gotest.tools/v3:
+            recommendations:
+              - github.com/stretchr/testify
+            reason: "Use one assertion library consistently across the codebase"
         - github.com/google/uuid:
             # Recommended modules that should be used instead. (Optional)
             recommendations:

NOTICE.txt

@@ -28552,29 +28552,6 @@ Contents of probable licence file $GOMODCACHE/gotest.tools/[email protected]/LICE
    limitations under the License.
 
 
---------------------------------------------------------------------------------
-Dependency : gotest.tools/v3
-Version: v3.5.1
-Licence type (autodetected): Apache-2.0
---------------------------------------------------------------------------------
-
-Contents of probable licence file $GOMODCACHE/gotest.tools/[email protected]/LICENSE:
-
-Copyright 2018 gotest.tools authors
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-
 --------------------------------------------------------------------------------
 Dependency : howett.net/plist
 Version: v1.0.1
@@ -73800,6 +73777,29 @@ See the License for the specific language governing permissions and
 limitations under the License.
 
 
+--------------------------------------------------------------------------------
+Dependency : gotest.tools/v3
+Version: v3.5.1
+Licence type (autodetected): Apache-2.0
+--------------------------------------------------------------------------------
+
+Contents of probable licence file $GOMODCACHE/gotest.tools/[email protected]/LICENSE:
+
+Copyright 2018 gotest.tools authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+
 --------------------------------------------------------------------------------
 Dependency : k8s.io/klog/v2
 Version: v2.130.1

go.mod

@@ -231,7 +231,6 @@ require (
 	golang.org/x/term v0.27.0
 	google.golang.org/genproto/googleapis/api v0.0.0-20241118233622-e639e219e697
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1
-	gotest.tools/v3 v3.5.1
 )
 
 require (

libbeat/otelbeat/oteltranslate/outputs/elasticsearch/config_otel_test.go

@@ -22,10 +22,10 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/confmap"
 	"gopkg.in/yaml.v2"
-	"gotest.tools/v3/assert"
 
 	"github.com/elastic/elastic-agent-libs/config"
 )
@@ -72,7 +72,7 @@ timeout: 1m30s
 user: elastic
 headers:
   X-Header-1: foo
-  X-Bar-Header: bar    
+  X-Bar-Header: bar
 batcher:
   enabled: true
   max_size_items: 1600
@@ -106,11 +106,11 @@ retry:
   enabled: true
   initial_interval: 1s
   max_interval: 1m0s
-  max_retries: 3  
-logs_index: some-index 
+  max_retries: 3
+logs_index: some-index
 password: changeme
-user: elastic  
-timeout: 1m30s 
+user: elastic
+timeout: 1m30s
 `
 
 		tests := []struct {
@@ -147,11 +147,11 @@ retry:
   enabled: true
   initial_interval: 5s
   max_interval: 5m0s
-  max_retries: 3  
-logs_index: some-index 
+  max_retries: 3
+logs_index: some-index
 password: changeme
-user: elastic  
-timeout: 1m30s 
+user: elastic
+timeout: 1m30s
 idle_conn_timeout: 1s
 num_workers: 1
 batcher: