Implement Tip / Contribution Banner 3.0

[Miyayes]

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1. New design Tipping banner 3.0 (frontend UI components) #29020
2. Use Chromium bubble
3. Make closeable when clicking outside of banner: Tipping banner should be non-modal, i.e. make it easily dismissable on clicking outside of the banner #23740
4. Handle new PCDN entries for channel page link (QA for this will happen later)
5. Implement spinner when balance cannot be fetched (as done for Show spinner and Loading... on NTP Rewards widget, Rewards panel, and rewards-internals page when balance cannot be fetched from custodian #28549). Resolved with: Add base::expected<>-style API to the "fetch balance" flow #28793

@Miyayes For Figma.