chore(testutil): add testutil.GoleakOptions (#16070)

- Adds `testutil.GoleakOptions` and consolidates existing options to
this location
- Pre-emptively adds required ignore for this Dependabot PR to pass CI
https://github.com/coder/coder/pull/16066

testutil/eventually_test.go

@@ -11,7 +11,7 @@ import (
 )
 
 func TestMain(m *testing.M) {
-	goleak.VerifyTestMain(m)
+	goleak.VerifyTestMain(m, testutil.GoleakOptions...)
 }
 
 func TestEventually(t *testing.T) {

testutil/goleak.go

@@ -0,0 +1,18 @@
+package testutil
+
+import "go.uber.org/goleak"
+
+// GoleakOptions is a common list of options to pass to goleak. This is useful if there is a known
+// leaky function we want to exclude from goleak.
+var GoleakOptions []goleak.Option = []goleak.Option{
+	// seelog (indirect dependency of dd-trace-go) has a known goroutine leak (https://github.com/cihub/seelog/issues/182)
+	// When https://github.com/DataDog/dd-trace-go/issues/2987 is resolved, this can be removed.
+	goleak.IgnoreAnyFunction("github.com/cihub/seelog.(*asyncLoopLogger).processQueue"),
+	// The lumberjack library is used by by agent and seems to leave
+	// goroutines after Close(), fails TestGitSSH tests.
+	// https://github.com/natefinch/lumberjack/pull/100
+	goleak.IgnoreTopFunction("gopkg.in/natefinch/lumberjack%2ev2.(*Logger).millRun"),
+	goleak.IgnoreTopFunction("gopkg.in/natefinch/lumberjack%2ev2.(*Logger).mill.func1"),
+	// The pq library appears to leave around a goroutine after Close().
+	goleak.IgnoreTopFunction("github.com/lib/pq.NewDialListener"),
+}