chore: remove concurrency tools from helpers (#86)

## Description Zarf was the only user of these tools, but we have since refactored our code to use `errgroups` rather than `ConcurrencyTools` https://github.com/defenseunicorns/zarf/pull/2460/files#diff-efb99da1ff0c60478a053ac9f6acfa8eba6237adc87cd430cdbf3b5a32d1b16c ## Related Issue Fixes #70
defenseunicorns · May 15, 2024 · ae18051 · ae18051
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diff --git a/helpers/concurrency.go b/helpers/concurrency.go
diff --git a/helpers/files.go b/helpers/files.go
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2024-Present Defense Unicorns
 
+// Package helpers provides common helper functions for Go.
 package helpers
 
 import (