Duplicate Tagged on previous release FIWARE_8.0

This release has no new changes, it is just duplicated tagged with previous release FIWARE_8.0
FIWARE_8.0 release notes is below
Integrate FogFlow with other FIWARE GEs over NGSI-LD
add the integration with IoTAgent(s) and also its detailed instructions
add multistage build scripts
add the yaml files and helm scripts to start FogFlow Cloud over kubernetes
add some application example based on NGSI-LD app template
fix the problem to reconnect to dgraph when starting up the entire FogFlow system
add the JMeter scripts to test the performance of thinBroker in FogFlow