[ENSCORESW-2612]. Send notification only when build status changes, on_success defaults to 'change' accoring to documentation.
[ENSCORESW-2612]. Send notification only when build status changes, on_success defaults to 'change' accoring to documentation.

ens-lgil/ensembl-rest,ens-lgil/ensembl-rest,ens-lgil/ensembl-rest,ens-lgil/ensembl-rest,ens-lgil/ensembl-rest