fix: Ensure donations don't show up as sponsors

[nzakas]

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• [x] I have read the contributing guidelines.

What is the purpose of this pull request?

What changes did you make? (Give an overview)

Siemens recently donated $1000 to ESLint through GitHub Sponsors, but it's showing up as a sponsor rather than a donation.

This updates our script to filter out any one-time sponsorships from the sponsors list (these are displayed as individual donations rather than sponsorships).

I also fixed the sorting of donations so that the Open Collective and GitHub donations are sorted in chronological order across both data sets.

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[amareshsm]

Nice catch! I’m nearly done with the changes. Hopefully, this will resolve the issue in other repositories as well. You can track the progress here: https://github.com/eslint/eslint.org/issues/619.