feat: add combined incentives - Merit part

[NandyBa]

General Changes
Two new Merit campaigns are being introduced, targeting wstETH supply on Arbitrum and Base.
The reward token for these campaigns will be awstETH, distributed directly from the respective chain where the wstETH supply is provided.

The purpose of these incentives is to attract wstETH liquidity, enabling LRT to grow and thrive in these markets.

• update incentive links with ARFC's link when forum post will be published

Developer Notes
Tokenlogic will soon publish an ARFC providing details about these incentives.

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Reviewer Checklist

Please ensure you, as the reviewer(s), have gone through this checklist to ensure that the code changes are ready to ship safely and to help mitigate any downstream issues that may occur.

• End-to-end tests are passing without any errors
• Code changes do not significantly increase the application bundle size
• If there are new 3rd-party packages, they do not introduce potential security threats
• If there are new environment variables being added, they have been added to the .env.example file as well as the pertinant .github/actions/* files
• There are no CI changes, or they have been approved by the DevOps and Engineering team(s)

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