test: add stress tests for polling hooks under slow/failing RPC conditions

[gloriaelishahabu]

[Adediwura-dev]

@Adediwura-dev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi, i can test this for you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Adediwura-dev to this issue.

[drips-wave]

Congratulations, @Adediwura-dev! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Adediwura-dev: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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