Alt text copy feature for the versions chart

[graphieros]

Describe the feature

Follow up to #1264
#1644 implemented the alt text copy feature for the trend charts as poc

Apply the feature to the versions chart.
The alt text is slightly different, as it should list the downloads per version.

Additional information

• Would you be willing to help implement this feature?

Final checks

• Read the contribution guide.
• Check existing issues.