Remove obsolete subprocess wait code

internal/adapters/subprocess/process_tree.go

@@ -1,9 +1,7 @@
 package subprocess
 
 import (
-	"context"
 	"errors"
-	"fmt"
 	"os/exec"
 	"time"
 )
@@ -22,39 +20,6 @@ type ownedProcessTree interface {
 	Dispose() error
 }
 
-func waitForOwnedCommand(ctx context.Context, tree ownedProcessTree, waitCh <-chan error, captureLimits <-chan *captureLimitError) (waitErr, ctxErr error, captureLimit *captureLimitError, cleanupErr error) {
-	select {
-	case waitErr = <-waitCh:
-		return waitErr, nil, nil, nil
-	case <-ctx.Done():
-		ctxErr = ctx.Err()
-	case captureLimit = <-captureLimits:
-	}
-
-	cleanupErr = tree.TerminateGracefully()
-	gracefulTimer := time.NewTimer(gracefulTerminationWait)
-	defer gracefulTimer.Stop()
-
-	select {
-	case waitErr = <-waitCh:
-		// The leader may exit before descendants finish graceful shutdown.
-		cleanupErr = joinErrors(cleanupErr, tree.TerminateForcefully())
-		return waitErr, ctxErr, captureLimit, cleanupErr
-	case <-gracefulTimer.C:
-	}
-
-	cleanupErr = joinErrors(cleanupErr, tree.TerminateForcefully())
-	forcefulTimer := time.NewTimer(forcefulTerminationWait)
-	defer forcefulTimer.Stop()
-
-	select {
-	case waitErr = <-waitCh:
-		return waitErr, ctxErr, captureLimit, cleanupErr
-	case <-forcefulTimer.C:
-		return nil, ctxErr, captureLimit, joinErrors(cleanupErr, fmt.Errorf("owned subprocess did not reap within %s after forceful termination", forcefulTerminationWait))
-	}
-}
-
 func joinErrors(errs ...error) error {
 	filtered := make([]error, 0, len(errs))
 	for _, err := range errs {