[Feature Request] Extend Commit Activity Stats Timeframe Without Overloading Dashboard

# Issue Description

> https://all.devstats.cncf.io/d/53/projects-health-table?orgId=1

The current commit activity display compares commits in the last (n) months to the previous (n) months. This statistic is valuable for understanding trends in commit activity over time. However, extending this timeframe to cover a more extended period without overloading the dashboard would be beneficial.

# Proposed Solution
1. Implement a feature that allows users to select custom timeframes for commit activity comparison (e.g., last six months vs. previous six months, last 12 months vs. previous 12 months, etc.).
2. Ensure that the extended commit activity stats do not clutter or overload the dashboard by optimizing the display or providing options for users to toggle between different timeframes.

# Benefits
- Provides users with more in-depth insights into commit activity trends.
- Enables users to analyze commit activity over custom timeframes.
- Maintains a clean and user-friendly dashboard while adding more detailed statistics.