docs: add Electron 31 blog post

This PR adds a new blog post for Electron 31. @electron/wg-releases, @electron/wg-outreach

Merge target: June 11th, after 31.0.0 releases.

⚠️ Do not merge until the following are completed ⚠️

[x] Update node, v8 and chromium versions from final chrome roll under Stack Changes section
[x] Edit link for M124 "New In Chrome" blog post
[x] Add a few bullets for New Features section
[x] Add any missing items in Breaking Changes section
[x] Update End of Support

Note: The "Check Blog links" job is going to fail until the Chrome 126 announcement blog comes out. A fail is expected until about Tuesday

electron / website