fix: remove unused TestContext (#1013)

The function `WithTestContext` is never called in the project, and
there is just one usage of `TestContext`, inside one of our loggers

Co-authored-by: Casey Lee <cplee@nektos.com>
Co-authored-by: Björn Brauer <bjoern.brauer@new-work.se>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/logger.go

@@ -58,12 +58,6 @@ func WithJobLogger(ctx context.Context, jobName string, config *Config, masks *[
 	nextColor++
 
 	logger := logrus.New()
-	if common.TestContext(ctx) {
-		fieldLogger := common.Logger(ctx)
-		if fieldLogger != nil {
-			logger = fieldLogger.(*logrus.Logger)
-		}
-	}
 	logger.SetFormatter(formatter)
 	logger.SetOutput(os.Stdout)
 	logger.SetLevel(logrus.GetLevel())