compat_mode isn't set properly in subscribe.pull mode

[tkxkd0159]

Summary of Bug

When we uses pull event source mode, hermes listen cannot set compat_mode properly. So It fails to unmarshal block_results if that chain uses 0.34 CometBFT.

Version

b076784

Steps to Reproduce

1. Set event source mode as pull
2. hermes listen --chain <chain-id>
3. Send any tx and show the parsing error

Acceptance Criteria

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned