chore(utils): deprecate mode sepolia

[andreivladbrg]

closes #1466

depends on #1464

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 95234e4e-6e6f-474e-ab95-ca5f1a15fc55

📥 Commits

Reviewing files that changed from the base of the PR and between 6c71783 and f2b642c.

📒 Files selected for processing (4)

• flow/scripts/solidity/FlowNFTDescriptorAddresses.sol
• foundry.base.toml
• lockup/scripts/solidity/LockupNFTDescriptorAddresses.sol
• utils/src/tests/ChainId.sol

💤 Files with no reviewable changes (3)

• foundry.base.toml
• lockup/scripts/solidity/LockupNFTDescriptorAddresses.sol
• flow/scripts/solidity/FlowNFTDescriptorAddresses.sol

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Walkthrough

The changes remove Mode Sepolia testnet support from the codebase across four files. This includes removing the chain ID mapping from NFT descriptor addresses files, removing the RPC endpoint configuration, and updating the chain ID utilities to reduce the testnet count from 5 to 4 while eliminating the MODE_SEPOLIA constant and its associated mappings.

Suggested reviewers

• smol-ninja

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore(utils): deprecate mode sepolia' accurately describes the main change: removing Mode Sepolia testnet support from the utils module and related files.
Description check	✅ Passed	The description references issue #1466 which is about stopping deployments to Mode Testnet, directly related to the changeset's objective of deprecating Mode Sepolia.
Linked Issues check	✅ Passed	The code changes fully implement the objective of issue #1466 by removing Mode Sepolia chain references from utils, flow NFT descriptor, lockup NFT descriptor, and foundry configuration.
Out of Scope Changes check	✅ Passed	All changes are in-scope: they consist solely of removing Mode Sepolia chain mappings, constants, and RPC endpoints across multiple files to deprecate Mode Testnet support.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/depracate-mode-sepolia

📝 Coding Plan

• Generate coding plan for human review comments

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