* FeedbackModal for the Embedding Homepage

* add source and change to correct endpoint

* fix tests, adding await and fixing endpoint

* use toEqual to also check for the source

* addresses PR feedback

* button becomes Send when email is written

* make 'comments' optional, trim inputs and refactor tests

* product-feedback endpoint (#40974)

* mvp of the proxy endpoint for the product feedback

* cleanup and fixes

* email :string -> ms/NonBlankString

* revert my solution

* Dan diff file

* makes fields other than source optional

* don't use default value in dev, to not spam the prod endpoint

* change from setting to function for product-feedback-url, as it's not meant to be changed by end users

* changed endpoint as per https://metaboat.slack.com/archives/C010ZSXQY87/p1712918951362979?thread_ts=1704910781.153589&cid=C010ZSXQY87



* fix wrong dismiss reason sent for 'I'm not interested right now'

* Update frontend/src/metabase/home/components/EmbedHomepage/EmbedHomepage.tsx

Co-authored-by: Mahatthana (Kelvin) Nomsawadi <me@bboykelvin.dev>

* renamed field: feedback -> comment

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Co-authored-by: Mahatthana (Kelvin) Nomsawadi <me@bboykelvin.dev>