fix(transactions): surface confirmation errors immediately

[pradhankukiran]

Summary

• retry transaction confirmation only when the inner poll times out
• return deterministic on-chain failures and other non-timeout confirmation errors immediately
• add a regression test for the retry classification and note the fix in the changelog

Validation

• cargo fmt
• cargo test
• cargo clippy

[0xIchigo]

Very based! Thank you for your contribution! 🔥