refactor(x/participationrewards/keeper): combine GetProtocolData+UnmarshalProtocolData #5255

Job	Run time
test quicksilver (amd64, linux)	2m 19s
build quicksilver (amd64, linux)	1m 41s
build quicksilver (amd64, windows)	1m 44s
test quicksilver (amd64, windows)	2m 12s
build quicksilver (amd64, darwin)	1m 35s
test quicksilver (darwin, arm64)	2m 23s
build quicksilver (darwin, arm64)	1m 47s
simulate quicksilver	0s
	13m 41s

Provide feedback