[chore] Enable all (passing) goleak checks (open-telemetry#30451)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
This PR contains 3 main changes:
1. Make a copy of the same file into every package whose `goleak` check
is currently passing. The only change for the `package_test.go` file in
each package is the package name itself.
2. Rename `processor/tailsamplingprocessor/main_test.go` to
`package_test.go` for uniformity. `package_test.go` is the name we chose
for core (see discussion
[here](open-telemetry/opentelemetry-collector#9173 (comment))).
3. Run `make gotidy` to add `goleak` dependency.

I included the script used to make these changes [in the
issue](open-telemetry#30438 (comment)).

**Link to tracking Issue:** <Issue number if applicable>
open-telemetry#30438

Author: crobert-1

cmd/opampsupervisor/go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/stretchr/testify v1.8.4
 	go.opentelemetry.io/collector/config/configtls v0.92.1-0.20240117180253-4371e14440ee
 	go.opentelemetry.io/collector/semconv v0.92.1-0.20240117180253-4371e14440ee
+	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.26.0
 )
 

cmd/opampsupervisor/go.sum

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package supervisor
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

cmd/opampsupervisor/supervisor/package_test.go

@@ -19,6 +19,7 @@ require (
 	go.opentelemetry.io/otel/sdk v1.21.0
 	go.opentelemetry.io/otel/sdk/metric v1.21.0
 	go.opentelemetry.io/otel/trace v1.21.0
+	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.26.0
 	golang.org/x/time v0.5.0
 	google.golang.org/grpc v1.60.1

cmd/telemetrygen/go.mod

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package common
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

cmd/telemetrygen/go.sum

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package logs
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

cmd/telemetrygen/internal/common/package_test.go

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package metrics
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

cmd/telemetrygen/internal/logs/package_test.go

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package traces
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

cmd/telemetrygen/internal/metrics/package_test.go

@@ -8,6 +8,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.48.0
 	github.com/stretchr/testify v1.8.4
 	go.opentelemetry.io/collector/confmap v0.92.1-0.20240117180253-4371e14440ee
+	go.uber.org/goleak v1.3.0
 	gopkg.in/yaml.v2 v2.4.0
 )