Fix: always use miningParametersSupplier

[fab-10]

PR description

#7102 introduced a regression that broke the ethereum_min_gas_price and ethereum_min_priority_fee metrics, since miningParameters where created twice, instead of always use the miningParametersSupplier

Fixed Issue(s)

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• Considered documentation and added the doc-change-required label to this PR if updates are required.
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Locally, you can run these tests to catch failures early:

• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests