feat: copy repo page `StarsChart` as image

[zeucapua]

Description

Repository page's Stars chart can now be copied as an image by clicking a button available on hover. Implemented with html2canvas-pro via CopyContainer; implements PostHog captures for analytics.

Related Tickets & Documents

Closes #4023

Mobile & Desktop Screenshots/Recordings

Steps to QA

1. Go to a repo page and hover over the 'Stars' chart

2. Click the button that appeared on the top right corner to copy the chart

3. Paste image to GitHub, Twitter, etc. textbox to see image and confirm information

4. Go to PostHog events and check if the click sent the event Repo Pages: clicked Stars chart

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