fix(wallet-api): align LLM prepareSignTransaction with LLD implementation [LIVE-12087]

[Justkant]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • LLM wallet-api and platform-sdk sign.transaction calls

📝 Description

Align LLM prepareSignTransaction with LLD implementation, the original PR is: #6759
We mainly remove the customGasLimit and type: 1 that doesn't seem to be used and instead rely on the convertToLiveTransaction to init everything as done in LLD

❓ Context

• JIRA or GitHub link: LIVE-12087

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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