fix: return all transactions when start is None in index get_account_…

[Rachit2323]

Bug

Calling get_account_transactions without a start value always returns empty results, even when the account has transactions.

Why

The code was using u64::MAX as a default for start. Then it filtered for blocks less than u64::MAX — but since the search started at u64::MAX, nothing was ever returned.

Fix

When start is not given, return all transactions instead of filtering.

Changes

• Fixed rs/ledger_suite/icrc1/index-ng/src/main.rs
• Fixed rs/ledger_suite/icp/index/src/main.rs
• Added tests to both test files

[github-actions]

Run on fb79603 URL: https://github.com/dfinity/ic/actions/runs/29121596911

[github-actions]

Run on f099a3f URL: https://github.com/dfinity/ic/actions/runs/29182385045