fix: add support for pepu token prices on pepe unchained v2

[sahar-fehri]

Explanation

PR to add support for prices for PEPU native token on PEPE unchained v2 network.

References

• Fixes [Bug]: PEPE Unchained Price Not Displaying metamask-extension#35412

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Add pepu currency and PEPE Unchained v2 chainId (0x17dcd) to Codefi V2 price service to enable native price fetching.

• Token Prices Service (packages/assets-controllers/src/token-prices-service/codefi-v2.ts):
  • Add pepu to SUPPORTED_CURRENCIES.
  • Add PEPE Unchained v2 chainId 0x17dcd to SUPPORTED_CHAIN_IDS.
• Changelog:
  • Document the additions under [Unreleased].

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