Add retry jitter helper for background polling jobs

[Chucks1093]

Summary
Add retry jitter helper for background polling jobs

Scope

• implement retry jitter utility for polling/backoff loops\n- apply helper in indexer polling paths\n- keep jitter bounds configurable

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[Benalex8797]

@Benalex8797 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

i want to work on this

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Congratulations, @Benalex8797! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Benalex8797: 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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This issue has been completed by @Benalex8797 as part of the Stellar Wave Program's 4th Wave 🥳

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