test(1781): assert token balance via mirror node (HIP-367)

[radkomih]

Description:

Restore the token balance and decimals assertions in TestIntegrationAccountBalanceQueryCanGetTokenBalance, which were previously commented out. Since HIP-367 removed token balances from the consensus AccountBalanceQuery response, the assertions now query the mirror node as the source of truth.

• Add getTokenBalanceFromMirror test helper that fetches an account's token balance and decimals from the mirror REST API, with bounded retries to absorb propagation delay
• Assert the operator's token balance (1_000_000) and decimals (18) via the mirror node instead of the consensus response

Related issue(s):

Fixes #1781

Notes for reviewer:

The consensus AccountBalanceQuery still runs to confirm the query succeeds, but token-level assertions are made against the mirror node since HIP-367 no longer returns token balances in the consensus response.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

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