[DOCS] Copy RN script from Elasticsearch (elastic/x-pack-elasticsearch#2163)
[DOCS] Copy RN script from Elasticsearch (elastic/x-pack-elasticsearch#2163)

* [DOCS] Copy RN script from Elasticsearch

* [DOCS] Update script to use repo token

* [DOCS] Add HTTP Tiny version req

* [DOCS] Comment out Release Notes links to private repo

* [DOCS] Add release note .github_auth error message

Original commit: elastic/x-pack-elasticsearch@328177d52a0b82cead5a423a5d14ac13d900bd4a

gfyoung/elasticsearch,coding0011/elasticsearch,robin13/elasticsearch,gingerwizard/elasticsearch,HonzaKral/elasticsearch,scorpionvicky/elasticsearch,HonzaKral/elasticsearch,gingerwizard/elasticsearch,uschindler/elasticsearch,nknize/elasticsearch,gfyoung/elasticsearch,coding0011/elasticsearch,uschindler/elasticsearch,uschindler/elasticsearch,GlenRSmith/elasticsearch,nknize/elasticsearch,uschindler/elasticsearch,coding0011/elasticsearch,gingerwizard/elasticsearch,coding0011/elasticsearch,coding0011/elasticsearch,gingerwizard/elasticsearch,scorpionvicky/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,scorpionvicky/elasticsearch,robin13/elasticsearch,scorpionvicky/elasticsearch,uschindler/elasticsearch,gingerwizard/elasticsearch,scorpionvicky/elasticsearch,gfyoung/elasticsearch,GlenRSmith/elasticsearch,nknize/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,gingerwizard/elasticsearch,HonzaKral/elasticsearch,nknize/elasticsearch,HonzaKral/elasticsearch,gfyoung/elasticsearch,robin13/elasticsearch,gfyoung/elasticsearch,gingerwizard/elasticsearch,robin13/elasticsearch,nknize/elasticsearch