DG: Add payout token list

[0xKurt]

Changes on Direct Grants:

This PR allows to remove the payout token from the Direct Grants Round creation form,
also it resolves the bug of setting a wrong/not existing token.

As a replacement for the pre-defined token a token list dropdown was added to the payout form.
The dropdown allows to chose a token form our payout token list and to payout with a custom token.

To Test:

• creating a direct grants round (without payout token)
• payout a grantee with a token from the dropdown
• payout a grantee with a custom token (i can send you some test token)

Screenshots:

Note: RND is a Random token i used for testing which is not in the payout token list

Custom token allows to paste in an address and loads the needed token information like symbol and decimals

a wrong token address shows an error

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: packages/round-manager/src/features/round/ApplicationDirectPayout.tsx

Function	Unhandled Issue
ApplicationDirectPayout	Error: "Payout token" not found in answers! Appli... Event Count: 3 Affected Users: 1

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[melissa-neira]

lgtm!