Adds remove_approval feature to treasury pallet (#11243)

* added remove_approval feature to treasury pallet

* Update frame/treasury/src/lib.rs

Co-authored-by: Xiliang Chen <[email protected]>

* treasury pallet refactoring: removed proposalId check in remove_approval call and trailing new line in tests file

* fmt

* cargo run --quiet --profile=production  --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark pallet --chain=dev --steps=50 --repeat=20 --pallet=pallet_treasury --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/treasury/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Update frame/treasury/src/lib.rs

Co-authored-by: joe petrowski <[email protected]>

* remove_approval extrinsic in treasury pallet:added extra checks in test and extra documentation

* refactored error logging on remove_approval extrinsic in treasury pallet

Co-authored-by: Xiliang Chen <[email protected]>
Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: Parity Bot <[email protected]>
Co-authored-by: joe petrowski <[email protected]>