test(internal/ethapi): align api_test coverage with geth ethapi

[gzliudan]

Proposed changes

Broaden internal/ethapi/api_test.go with content-level parity checks against geth where behavior is compatible.

• Expand RPC retrieval coverage for block/header/receipt and transaction queries, including hash/number selectors, pending/fullTx modes, and not-found paths.
• Add and refine transaction fill/sign/send test paths, including validation and pricing-mode combinations.
• Deepen EstimateGas/Call/CreateAccessList/SimulateV1 assertions for block reference forwarding, state overrides, validation errors, transfer logs, precompile movement, storage state buildup, and VM error reporting.
• Keep the change test-only (single file) with no runtime behavior modifications.

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

Which parts of the codebase does this PR touch?
Put an ✅ in the boxes that apply

• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• 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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