Fix unhandled promise rejection in horizon ping timeout

[OluwapelumiElisha]

Description

Resolves an unhandled promise rejection in the Stellar service when a Horizon node times out.

Previously, pingHorizon utilized Promise.race alongside a setTimeout function. If the network call resolved successfully before the timeout expired, the timeout promise would eventually reject in the background, causing an "Unhandled Promise Rejection" error that couldn't be caught by the outer block.

This PR properly clears the background timeout when the race resolves, preventing the rogue rejection and ensuring a cleaner execution profile and better system stability.

Changes Made

• Added a clearTimeout handler to the pingHorizon method in src/services/stellar/stellarService.ts.

Related Issues

Fixes #1779

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