Increase the limit of the listed Helm charts under one repo

Proposal

According to the Helm repository documentation, "When requesting a package, GitLab considers only the 300 most recent packages created. For each package, only the most recent package file is returned."

If there are more than 300 packages uploaded, using helm repo list returns not all the charts.

That really limits the use of a single repository for all charts from different projects under one namespace.

Having to register a repository per chart is not going to work for that use case.

Consider increasing the limit of listed Helm charts.