chore(integrationv2): add license header

[jmayclin]

Description of changes:

Change the header_mistake_scanner.sh to catch errors with the integv2 files, and fix the mistakes.

Call-outs:

This change was autogenerated by modifying header_mistake_scanner

diff --git a/codebuild/bin/header_mistake_scanner.sh b/codebuild/bin/header_mistake_scanner.sh
index d6d7cd2c6..6a72fb1ca 100755
--- a/codebuild/bin/header_mistake_scanner.sh
+++ b/codebuild/bin/header_mistake_scanner.sh
@@ -27,6 +27,10 @@ S2N_FILES+=$(find "$PWD" -type f -name "*.rs" | grep -v target)
 
 FAILED=0
 
+LICENSE_HEADER="# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+"
+
 for file in $S2N_FILES; do
     # The word "Copyright" should appear at least once in the first 4 lines of every file
     COUNT=`head -4 $file | grep "Copyright" | wc -l`;
@@ -44,6 +48,10 @@ for file in $S2N_FILES; do
     then
         FAILED=1;
         echo "License Check Failed: $file";
+
+        # Insert the license header at the top of the file
+        echo "$LICENSE_HEADER$(cat $file)" > $file;
+        echo "License added to: $file";
     fi
 done

Testing:

The header mistake scanner now passes.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.