[ty] Deploy ecosystem diff to Cloudflare pages (#19234)
## Summary
Changes the ecosystem-analyzer workflow to deploy the diff to Cloudflare
pages and post a link in the PR. Also adds a summary statistics to that
PR comment.
## Test Plan
The comment below:
https://github.com/astral-sh/ruff/pull/19234#issuecomment-3053205937. I
previously had some dummy changes on this PR to see a non-zero diff. And
I didn't reapply the label after I reverted that change, such that it's
still visible for reviewers.
