feat: add ARC mainnet in token scanning

[maxime-oe]

Explanation

Adds ARC mainnet to Token Scanning in phishing-controller.

DO NOT MERGE until https://github.com/consensys-vertical-apps/va-mmcx-security-alerts-api/pull/194 (API) is merged.

References

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
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Single additive chain mapping with no auth or logic changes; effectiveness depends on the upstream API supporting arc.

Overview
Adds Arc mainnet to phishing-controller token scanning by mapping chain id 0x13b2 to arc in DEFAULT_CHAIN_ID_TO_NAME, so bulkScanTokens and related flows can resolve the chain name when calling the security alerts API.

The unreleased changelog entry documents the new network support. Deploy order: the matching security-alerts API change should land before this is merged.

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[maxime-oe]

Already included in #9506