fix: add Testnet ticker MegaETH to controller-utils

[stanleyyconsensys]

Explanation

Due to the release of version 12.14.0 in the extension, we are introducing MegaETH Testnet as a new default test network.

When users enable "Show conversion on test networks" in Advanced settings, the MegaETH ticker should display proper currency conversion rates, similar to other testnet tokens like SepoliaETH and LineaETH, rather than showing null.

Test Plan

• Verify MegaETH testnet appears in network list with proper ticker
• Confirm currency conversion displays correctly for MegaETH when "Show conversion on test
  networks" in advanced settings is enabled

References

Changelog

@metamask/controller-utils

• ADDED: Add Ticker MegaETH to constants TESTNET_TICKER_SYMBOLS and NetworksTicker

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 highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[stanleyyconsensys]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. See these instructions for more information about preview builds.

Expand for full list of packages and versions.

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[stanleyyconsensys]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. See these instructions for more information about preview builds.

Expand for full list of packages and versions.

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