fix(transaction-pay-controller): inherit isGasFeeSponsored for same-chain relay transactions

[matthewwalsh0]

Explanation

When a parent transaction has isGasFeeSponsored: true and the Relay quote is same-chain (source and target chain match the parent), the TPC was not carrying that sponsorship through to either the source-network fee display or the submission options passed to TransactionController.

This PR fixes that in two places:

• Quote time (calculateSourceNetworkCost): same-chain sponsored routes now early-return with zeroed fees and gasLimits: [0], is7702: true, skipping the full gas estimation. Sponsored transactions go through the EIP-7702 gas station hook so user-paid gas is not needed.
• Submit time (submitViaTransactionController): isGasFeeSponsored is now derived from the parent transaction and passed directly into both addTransaction and addTransactionBatch options, and gasFeeToken is suppressed when sponsored.

Additionally, skipInitialGasEstimate: true is added to direct mUSD vault deposit submissions, which follow the same sponsored path.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them