Cherry-pick[5.3.2]: Update GrpcRemoteDownloader to only include relevant headers. #16448
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Fixes GHSA-mxr8-q875-rhwq.
RELNOTES[INC]: GrpcRemoteDownloader only includes relevant headers instead of sending all credentials.
Closes #16439.
PiperOrigin-RevId: 480069164
Change-Id: I49950311c04d1997d26832431d531a9036efdb18