js.core: rpc: Remove the Blessings and Discharges fields from the rpc request header.
js.core: rpc: Remove the Blessings and Discharges fields from the rpc request
header.

They are no longer used since blessings are communicated at the flow level.

Change-Id: I727672dd19c070ea22d3a7b417f5d4058a49b453
MultiPart: 2/2

vanadium/js,vanadium/js,vanadium/js,vanadium/js