feat: add a quote reaction + text hint for removing quote embeds

[michal-skraburski]

This feature hints to the user the quote embed can be deleted.

Previously, the user would link a message and the bot would reply to the message with an embed displaying the quoted message/image. It also supported deleting the embed but the current format of the embed would make no attempt to hint that it was possible to delete the embed.

I've made sure to test the feature actually works:

[wiktoriavh]

generally code looks good to me, just slight changes needed.

makes me also wonder why not just add a button. there already is a button for "jump to message", why isn't there one for deleting the quote? why the workaround with an emoji? 🤔

[wiktoriavh]

not needed, you are just renaming embed to something else. could just use embed directly from what i see.

[hmd-ali]

it is needed, existingField is a field in the embed, existingFieldEmbed is the whole embed containing the specific field, which we're using later to check it's footer for the existing hint or add a new one.

[wiktoriavh]

Also if it is for a ticket, include the ticket number in the pr title and in the body, like so:

Title: feat(#123): foo bar
Body: Closes #123

Github will then automatically connect pr to issue and auto close the issue if it gets merged.

[hmd-ali]

generally code looks good to me, just slight changes needed.

makes me also wonder why not just add a button. there already is a button for "jump to message", why isn't there one for deleting the quote? why the workaround with an emoji? 🤔

A button would draw too much attention, this is meant to be subtle. Only the user who triggered the quote should be able to delete it, and I didn't want a destructive looking button visible to everyone else who sees the message. That's why I suggested a small hint in the footer instead. It's discoverable if you're looking for it, but it doesn't compete visually with the rest of the embed the way a full button would.