[Azure Core] Memory leak on netty-buffer

[mssfang]

There could be a memory leak on netty-buffer.

More detail report from a customer's reported issue reference:
https://stackoverflow.com/questions/73500609/memory-leak-issue-of-the-object-io-netty-buffer-pooledbytebufallocator-from-jar

Local run stats:
com.azure.core.http.netty.NettyAsyncHttpClientTests
Aug 26, 2022 9:44:13 AM io.netty.util.ResourceLeakDetector reportTracedLeak
SEVERE: LEAK: ByteBuf.release() was not called before it's garbage-collected. See https://netty.io/wiki/reference-counted-objects.html for more information.

[alzimmermsft]

Fix PR resolves tests that report ByteBuf leaks, further investigation is on-going to determine whether the test leak and mentioned StackOverflow have the same root issue.