chore(github): shorten ci.yaml workflow and job names

ce - cactus-example
cp - cactus-plugin
cpk - cactus-plugin-keychain
cpl - cactus-plugin-ledger
cplc - cactus-plugin-ledger-connector
plc - plugin-ledger-connector
cpp - cactus-plugin-persistence
ct - cactus-test
ctp - cactus-test-plugin

Fixes: hyperledger#2624

Signed-off-by: zondervancalvez <[email protected]>