Provide WSS bootnodes for Rococo and Westend parachains (#4161)

Some Rococo parachains lacked WS nodes. `ws/wss` endpoints are necessary
for using light clients on the testnet.

Changes:
1. Add `ws/wss` endpoints to all testnet parachains.
2. Remove decommissioned nodes (`people-collator-node-2`
`people-collator-node-3` ).