chore: add mock system mode enum

[nadin-Starkware]

Stack:

• feat: add test case for remote connection flow #2647
• chore: add mock_system_mode to create config function #2646
• chore: return vector of SequencerNodeConfig in create config function #2638
• chore: add get_http_server_config function #2637
• chore: change sequencer_node_handle type #2636
• chore: add serial_test crate #2635
• chore: add mock system mode enum #2632 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[reviewable-StarkWare]

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.00%. Comparing base (e3165c4) to head (b89d319).
Report is 814 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2632      +/-   ##
==========================================
- Coverage   40.10%   35.00%   -5.10%     
==========================================
  Files          26      277     +251     
  Lines        1895    32227   +30332     
  Branches     1895    32227   +30332     
==========================================
+ Hits          760    11282   +10522     
- Misses       1100    19938   +18838     
- Partials       35     1007     +972     

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[Itay-Tsabary-Starkware]

Reviewable status: 0 of 2 files reviewed, 1 unresolved discussion (waiting on @nadin-Starkware)

---

crates/starknet_integration_tests/src/definitions.rs line 5 at r1 (raw file):

    Local,
    Remote,
}

Please unify this with the pr that uses this, it's too out of context as is 🙏

Code quote:

#[derive(Debug, Clone)]
pub enum MockSystemMode {
    Local,
    Remote,
}