Consistently use `mmm dd, yyyy` format for analytics dates

What does this MR do and why?

Consistently use mmm dd, yyyy format for analytics dates. Converts Value stream, contributor and CI/CD analytics.

Areas that have been updated:

• Total time chart
• Stage time chart
• Contributor analytics charts
• Pipelines date range
• Deployment frequency chart

Areas that have not been updated:

• Pipelines chart was not updated in this MR as the date ranges are generated on the backend. This was separated into a separate issue (#432822)

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Create test project:
  • FILTER=customizable_cycle_analytics SEED_CUSTOMIZABLE_CYCLE_ANALYTICS=1 bundle exec rake db:seed_fu
• Navigate to the newly created project
• Analyze > Value stream analytics
  • Overview tab: Verify date on X axis and in tooltip
  • Any other tab: Verify date on X axis and in tooltip
• Analyze > Contributor statistics
  • Top graph: Verify date in tooltip
  • User graphs: Verify date in tooltip
• Analyze > CI/CD analytics
  • Pipelines tab: Verify date range above the chart
  • Any other tab: Verify date range above the chart, and the date on the X axis and in tooltip

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #420815 (closed)