Add a search field for the templates of the Pharo launcher

[DamienCassou]

Reported by Vincent Blondeau

It would be nice if we can search into the template list for a job.

For instance, if we search Fuel, we will get the jobs: Fuel-Benchmarks, Fuel-Development (in the Pharo Jenkins), ..., Fuel-Moose (in the Moose jenkins).