Provide proper CI variables for topic branches (may solve plenty of environment:url issues)

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Proposal

This proposal presents the inclusion of topic branches related predefined variables.

Considering that:

• feature/cool-stuff, hotfix/its-broken, docs/improve-readme are examples of widely used topic branches naming conventions.
• environment:url can only be set based on predefined variables.
• review/foo is widely used within Auto DevOps.
• Grouping of environments is encouraged throughout GitLab documentation.

This proposal presents the inclusion of topic branches related predefined variables, using the slash denominator as grouping:

CI_COMMIT_REF_NAME	CI_COMMIT_REF_SLUG	CI_COMMIT_TOPIC_GROUP	CI_COMMIT_TOPIC_NAME
feature/cool-stuff	feature-cool-stuff	feature	cool-stuff
hotifix/its-broken	hotfix-its-broken	hotfix	its-broken
release/v12	release-v12	release	v12

That would make it possible for some cool naming on environments:

if using environment:url as https://${CI_COMMIT_TOPIC_NAME}.${CI_COMMIT_TOPIC_GROUP}.example.com

CI_COMMIT_REF_NAME	CI_COMMIT_TOPIC_GROUP	CI_COMMIT_TOPIC_NAME	environment:url
feature/cool-stuff	feature	cool-stuff	https://cool-stuff.feature.example.com
hotifix/its-broken	hotfix	its-broken	https://its-broken.hotfix.example.com
release/v12	release	v12	https://v12.release.example.com

Also, environment:name set as ${CI_COMMIT_TOPIC_GROUP}/${CI_COMMIT_TOPIC_NAME} would provide:

CI_COMMIT_REF_NAME	CI_COMMIT_TOPIC_GROUP	CI_COMMIT_TOPIC_NAME	environment:name
feature/cool-stuff	feature	cool-stuff	feature/cool-stuff
hotfix/its-broken	hotfix	its-broken	hotfix/its-broken
release/v12	release	v12	release/v12

Or grouping as review/${CI_COMMIT_TOPIC_NAME}:

CI_COMMIT_REF_NAME	review/${CI_COMMIT_TOPIC_NAME}	{CI_COMMIT_TOPIC_GROUP}/{CI_COMMIT_TOPIC_NAME}
feature/cool-stuff	review/cool-stuff	feature/cool-stuff
hotfix/its-broken	review/its-broken	hotfix/its-broken