Group similar builds

We group builds by removing from the builds name two numbers which are delimited by whitespace or colon:
* `name 0 1` => `name`
* `name 0:1` => `name`
* `name 0/1` => `name`
* `name 0:1 ruby` => `name ruby`
* `name 0/1 ruby` => `name ruby`
* `0 1 name ruby` => `name ruby`
* `0:1 name ruby` => `name ruby`
* `0/1 name ruby` => `name ruby`

See merge request !6242