test: replace go-test/deep with google/go-cmp (#39902)

go-test/deep is only used once and can be safely replaced with
google/go-cmp which is already used for other tests.
The error message changes a bit.

Before:
--- FAIL: TestJsonToSynthEvent (0.00s)
    --- FAIL: TestJsonToSynthEvent/a_valid_line (0.00s)
        synthexec_test.go:94: [TimestampEpochMicros: 7.165676811882693e+18 != 1.7165676811882693e+19]
FAIL
FAIL    github.com/elastic/beats/v7/x-pack/heartbeat/monitors/browser/synthexec 0.180s
FAIL

After:
--- FAIL: TestJsonToSynthEvent (0.00s)
    --- FAIL: TestJsonToSynthEvent/a_valid_line (0.00s)
        synthexec_test.go:95:   &synthexec.SynthEvent{
                ... // 3 identical fields
                Step:                 &{Name: "Go to home page", Status: "succeeded"},
                Journey:              &{Name: "inline", ID: "inline"},
            -   TimestampEpochMicros: 7.165676811882693e+18,
            +   TimestampEpochMicros: 1.7165676811882693e+19,
                Payload:              {"duration_ms": float64(3472), "source": string("async ({page, params}) => {await page.goto('http:
                Blob:                 "",
                ... // 1 ignored and 5 identical fields
              }

FAIL
FAIL    github.com/elastic/beats/v7/x-pack/heartbeat/monitors/browser/synthexec 0.197s
FAIL

NOTICE.txt

@@ -17002,37 +17002,6 @@ Exhibit B - "Incompatible With Secondary Licenses" Notice
   defined by the Mozilla Public License, v. 2.0.
 
 
---------------------------------------------------------------------------------
-Dependency : github.com/go-test/deep
-Version: v1.0.7
-Licence type (autodetected): MIT
---------------------------------------------------------------------------------
-
-Contents of probable licence file $GOMODCACHE/github.com/go-test/[email protected]/LICENSE:
-
-MIT License
-
-Copyright 2015-2017 Daniel Nichter
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-
-
 --------------------------------------------------------------------------------
 Dependency : github.com/gocarina/gocsv
 Version: v0.0.0-20170324095351-ffef3ffc77be

go.mod

@@ -89,7 +89,6 @@ require (
 	github.com/fsnotify/fsnotify v1.5.1
 	github.com/go-sourcemap/sourcemap v2.1.2+incompatible // indirect
 	github.com/go-sql-driver/mysql v1.6.0
-	github.com/go-test/deep v1.0.7
 	github.com/gocarina/gocsv v0.0.0-20170324095351-ffef3ffc77be
 	github.com/godbus/dbus/v5 v5.0.6
 	github.com/godror/godror v0.33.2

go.sum

@@ -807,8 +807,6 @@ github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
 github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572/go.mod h1:9Pwr4B2jHnOSGXyyzV8ROjYa2ojvAY6HCGYYfMoC3Ls=
-github.com/go-test/deep v1.0.7 h1:/VSMRlnY/JSyqxQUzQLKVMAskpY/NZKFA5j2P+0pP2M=
-github.com/go-test/deep v1.0.7/go.mod h1:QV8Hv/iy04NyLBxAdO9njL0iVPN1S4d/A3NVv1V36o8=
 github.com/go-zookeeper/zk v1.0.2/go.mod h1:nOB03cncLtlp4t+UAkGSV+9beXP/akpekBwL+UX1Qcw=
 github.com/gobuffalo/attrs v0.0.0-20190224210810-a9411de4debd/go.mod h1:4duuawTqi2wkkpB4ePgWMaai6/Kc6WEz83bhFwpHzj0=
 github.com/gobuffalo/depgen v0.0.0-20190329151759-d478694a28d3/go.mod h1:3STtPUQYuzV0gBVOY3vy6CfMm/ljR4pABfrTeHNLHUY=

x-pack/heartbeat/monitors/browser/synthexec/synthexec_test.go

@@ -16,7 +16,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/go-test/deep"
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/stretchr/testify/require"
 )
 
@@ -90,7 +91,7 @@ func TestJsonToSynthEvent(t *testing.T) {
 				require.NoError(t, err, "for line %s", tt.line)
 			}
 
-			if diff := deep.Equal(gotRes, tt.synthEvent); diff != nil {
+			if diff := cmp.Diff(gotRes, tt.synthEvent, cmpopts.IgnoreUnexported(SynthEvent{})); diff != "" {
 				t.Error(diff)
 			}
 		})