Resolve "Add `New Hire Location Factor` KPI charts"

Why is this change being made?

New KPI: New Hire Average Location Factor

What is is: Average location factor for new hires in the past 3 months

Review links:

• Engineering: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/engineering/performance-indicators/index.html#engineering-new-hire-average-location-factor
• Development: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/engineering/development/performance-indicators/index.html#development-new-hire-average-location-factor
• Infrastructure: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/engineering/infrastructure/performance-indicators/index.html#infrastructure-new-hire-average-location-factor
• Quality: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/engineering/quality/performance-indicators/index.html#quality-new-hire-average-location-factor
• UX: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/engineering/ux/performance-indicators/index.html#ux-new-hire-average-location-factor
• Security: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/engineering/security/performance-indicators/index.html#security-new-hire-average-location-factor
• Support: https://8540-add-new-hire-location-factor-kpi-charts.about.gitlab-review.app/handbook/support/performance-indicators/index.html#support-new-hire-average-location-factor

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per [say-why-not-just-what][transparency]
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to your manager.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in [#mr-buddies][mr-buddies-slack].
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files.

Closes #8540 (closed)