Deploy priority registry in fake genesis and report as system contract

[LorenzSchueler]

This PR deploys the priority registry in the fake genesis when the priorities feature is enables and report as it as a system contract.

[Copilot]

Pull request overview

Deploys the Transaction Priority Registry into the fake JSON genesis when TransactionPriorities is enabled and exposes its address via the ethapi “system contracts” registry so clients can discover it at runtime.

Changes:

• Deploys PriorityRegistry as a proxy + implementation pair in GenerateFakeJsonGenesis when upgrades.TransactionPriorities is enabled.
• Adds TRANSACTION_PRIORITY_REGISTRY_ADDRESS to activeSystemContracts() when priorities are enabled.
• Extends integration/unit tests to validate registry deployment in fake genesis and to ensure fork IDs / system-contract reporting varies with the priorities upgrade flag.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
integration/makefakegenesis/json.go	Adds fake-genesis deployment of the Priority Registry (proxy + implementation) gated by TransactionPriorities.
integration/makefakegenesis/json_test.go	Adds coverage ensuring registry contracts are only deployed when the corresponding upgrade is enabled and that proxy wiring is correct.
api/ethapi/config.go	Exposes the Priority Registry address as a discoverable system contract when enabled.
api/ethapi/config_test.go	Updates tests to account for the new upgrade flag in fork ID uniqueness and system-contract reporting.

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[LuisPH3]

The PR adds the new registry to the fake net and updates rpc methods to publish the address

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
api/ethapi/config.go	90.24% <100.00%> (+0.50%)	⬆️
integration/makefakegenesis/json.go	95.04% <100.00%> (+0.51%)	⬆️

... and 8 files with indirect coverage changes

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