fix: add existing rewards to a guild

[BrickheadJohnny]

Users sometimes do not notice the rewards which they already use in their guild in the quick add section, so we display these rewards in components like DiscordGuildSetup too. We forgot to handle & test this case in a recent refactor, so this feature caused some errors. This PR aims to fix the issue by checking if a guildPlatform with a specific platformGuildId already exists in the guild, and optionally adding a guildPlatformId field to the rolePlatform in that case, so our API knows that we shouldn't try to create a new guildPlatform in our DB, but we should re-use an existing one. I added a longer comment about it too. We also display a settings modal when the user wants to add an existing reward to a role. I haven't added this modal to the AddSolutionsModal, because in my opinion users will probably click on that button if they want to add a brand new reward to their guild, but let me know if we should add it there too.

As a side quest, I completely removed some unused files & added the new solutions modal to the group page too.

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Name	Status	Preview	Comments	Updated (UTC)
guild-xyz	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 18, 2024 10:51am
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[dovalid]

I agree with you about adding the settings modal to the AddSolutionModal, I'm sure we're good this way for now