locate: retry on ErrClientGetResourceGroup for transient errors

[disksing]

When receiving ErrClientGetResourceGroup error, distinguish between permanent and transient errors:

• For 'resource group not found' error, return directly without retry since it's a permanent error
• For other errors (e.g., 'not leader'), apply backoff and retry since they are transient errors

Add test case TestOnSendFailByResourceGroupError to cover both scenarios:

1. Test that 'resource group not found' returns immediately without backoff
2. Test that other errors trigger retry with backoff

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: iosmanthus, ystaticy

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[LGTM Timeline notifier]

Timeline:

• 2025-10-22 06:12:08.888394831 +0000 UTC m=+852234.965647391: :ballot_box_with_check: agreed by iosmanthus.