fix: remove gasPrice property from linea_estimateGas request

[matthewwalsh0]

Explanation

The LineaGasFeeFlow in the TransactionController aims to provide more accurate gas fee estimates derived from a specific transaction, rather than just at the network level.

This is achieved via a request to the custom linea_estimateGas RPC method on the provider.

Originally, the gasPrice property was necessary to prevent a bug, but now that issue has been fixed remotely, it is itself causing an alternate bug that returns the following error mesage:

transaction up-front cost 0x16e360000000000 exceeds transaction sender account balance 0x7b2c1918e11642

This PR simply removes the gasPrice property from the request.

References

Changelog

### Fixed

- Remove `gasPrice` from requests to `linea_estimateGas` ([#4737](https://github.com/MetaMask/core/pull/4737))

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

[matthewwalsh0]

@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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