[native-bridge] - add e2e test to test Sui bridge pause. (MystenLabs#…

…17846)

## Description 

... and some refactoring to e2e test utils

## Test plan 

e2e tests

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## Release notes

Check each box that your changes affect. If none of the boxes relate to
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that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] Indexer: 
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK: