Add exp backoff to marketplace contract

[eloylp]

Referenced PR

Continuation of #89

Summary of changes

• Add exp backoff to marketplace integration tests.

Reviewer recommendations

• Check code.
• CHeck CI has no failures.

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Name	Status	Preview	Comments	Updated (UTC)
eiger-nebula	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 19, 2023 8:45am