Sync eng/common directory with azure-sdk-tools for PR 8294 (#40244)

* consume newest stable version of the test-proxy

* remove proxy override file to resume honoring the eng/common proxy version

---------

Co-authored-by: Scott Beddall <scbedd@microsoft.com>

Author: azure-sdk

eng/common/testproxy/target_version.txt

@@ -1 +1 @@
-1.0.0-dev.20240410.1
+1.0.0-dev.20240516.2