fluentbit Extension: Fix flaky test (#1850)

The failures reported in #1848 seem to be caused by the issue described
in golang/go#22315 and the fact that we run
tests in parallel.

extension/fluentbitextension/process_linux_test.go

@@ -56,7 +56,7 @@ func setup(t *testing.T, conf *Config) (*processManager, **process.Process, func
  err = mockScriptFile.Chmod(0700)
  require.Nil(t, err)
 
- mockScriptFile.Close()
+ require.NoError(t, mockScriptFile.Close())
 
  conf.ExecutablePath = mockScriptFile.Name()
  pm := newProcessManager(conf, logger)
@@ -81,7 +81,6 @@ func setup(t *testing.T, conf *Config) (*processManager, **process.Process, func
 }
 
 func TestProcessManager(t *testing.T) {
- t.Parallel()
  ctx, cancel := context.WithCancel(context.Background())
  defer cancel()
 
@@ -116,7 +115,6 @@ func TestProcessManager(t *testing.T) {
 }
 
 func TestProcessManagerArgs(t *testing.T) {
- t.Parallel()
  ctx, cancel := context.WithCancel(context.Background())
  defer cancel()
 
@@ -142,7 +140,6 @@ func TestProcessManagerArgs(t *testing.T) {
 }
 
 func TestProcessManagerBadExec(t *testing.T) {
- t.Parallel()
  ctx, cancel := context.WithCancel(context.Background())
  defer cancel()
 
@@ -163,7 +160,6 @@ func TestProcessManagerBadExec(t *testing.T) {
 }
 
 func TestProcessManagerEmptyConfig(t *testing.T) {
- t.Parallel()
  ctx, cancel := context.WithCancel(context.Background())
  defer cancel()