fix(eth/gasestimator,internal/ethapi): fix block overrides in estimate gas #34081

[gzliudan]

Proposed changes

Align estimateGas with the geth backport by consistently using the block-overridden header for CallDefaults, ToMessage, and gas estimator options.

Drop estimator-side block override plumbing and cap the search upper bound to MaxTxGas when Osaka rules are active (EIP-7825), preventing oversized estimates under Osaka.

Ref: ethereum#34081

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• build: Changes that affect the build system or external dependencies
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• chore: Changes that don't change source code or tests
• docs: Documentation only changes
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• fix: A bug fix
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• refactor: A code change that neither fixes a bug nor adds a feature
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• test: Adding missing tests or correcting existing tests

Impacted Components

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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Pull request overview

Refactors DoEstimateGas to use a single effective block header after applying BlockOverrides, ensuring gas estimation options and transaction defaults are derived from the same header context.

Changes:

• Remove the separate estimationHeader alias and reuse header after applying blockOverrides.
• Use the overridden header consistently for gasestimator.Options, CallDefaults, and ToMessage.

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