Add the Feature Farmer workflow pattern (#56614)

* Add Feature Farmer workflow and pattern

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Rename Feature Farmer to Feature Grower

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Add Feature Grower scheduling backpressure

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Update astro.config.mjs

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Co-authored-by: Peli de Halleux <pelikhan@users.noreply.github.com>