A few improvements for EP infra project

Context

Closes https://gitlab.com/gitlab-org/quality/engineering-productivity-infrastructure/-/issues/67

What does this MR do?

• Ignores gitlab-runner terraform module
• Only create MRs for major/minor versions (no patches) for helm charts, as most of the time we don't need to upgrade those right away
• Removes Non-categorized Terraform files MRs, as they contain upgrades for 7-8 tool at once, which is impractical (see an example)