Revert "Revert "[ACIX-835] Update testify to v1.11.1" (#42017)" (#42020)

This reverts commit aa9e94f.

### What does this PR do?

Re-apply #41981 and fix the tests that it broke.

### Motivation

Same as #41981: speed up tests execution thanks to stretchr/testify#1427 that makes `require.EventuallyWithT` test the condition immediately instead of waiting for an initial delay before making the very first try.

### Describe how you validated your changes

Launched a [full pipeline](https://gitlab.ddbuild.io/DataDog/datadog-agent/-/pipelines/79481153) to be sure to run all the tests and not a subset of them: #42020 (comment)

### Additional Notes

The main feature we were looking for by upgrading `testify` to `v1.11.1` was the fact that that `require.EventuallyWithT` is now evaluating the condition the first time immediately instead of waiting for a `tick` delay before making the first try.
This unexpectedly broke the tests that are touched in this PR.
Fixing tests by adding a `time.Sleep(…)` is most probably not the smartest way of fixing them. But it restores the execution time flow of the previous versions of `testify` that happened to make the tests pass.

Co-authored-by: guyarb <[email protected]>

Author: L3n41c

comp/otelcol/otlp/components/exporter/serializerexporter/go.mod

@@ -217,9 +217,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
-// Pin github.com/stretchr/testify to v1.10.0 while waiting for https://github.com/DataDog/datadog-agent/pull/40182
-replace github.com/stretchr/testify => github.com/stretchr/testify v1.10.0
-
 // This section was automatically added by 'dda inv modules.add-all-replace' command, do not edit manually
 
 replace (

comp/otelcol/otlp/components/exporter/serializerexporter/go.sum

@@ -1173,6 +1173,7 @@ func (s *TracerSuite) TestTCPEstablished() {
 	c.Close()
 
 	// Wait for the connection to be sent from the perf buffer
+	time.Sleep(100 * time.Millisecond)
 	require.EventuallyWithT(t, func(collect *assert.CollectT) {
 		var ok bool
 		connections, cleanup := getConnections(collect, tr)
@@ -1210,6 +1211,7 @@ func (s *TracerSuite) TestTCPEstablishedPreExistingConn() {
 	c.Close()
 
 	// Wait for the connection to be sent from the perf buffer
+	time.Sleep(100 * time.Millisecond)
 	var conn *network.ConnectionStats
 	require.EventuallyWithT(t, func(collect *assert.CollectT) {
 		var ok bool