test(gamma): add coverage for uma_resolution_status values

[skyc1e]

Summary

Add test coverage for the three uma_resolution_status values accepted by the Gamma API:

• proposed — resolution has been proposed via UMA oracle
• disputed — proposed resolution has been disputed
• resolved — resolution is finalized

Also adds a test confirming the field is omitted from the query string when unset.

Verification

Values were confirmed against the live Gamma API — each returns real market data when used as a ?uma_resolution_status= filter. The umaResolutionStatuses field in API responses independently confirms the same three values (e.g. ["proposed", "resolved"], ["proposed", "disputed"]).

Changes

• tests/gamma.rs: 4 new tests, no production code changes

The existing markets_request_all_params test already covers "resolved". These tests cover the remaining values individually and verify omission behavior.

Closes #252

---

Note

Low Risk
Low risk: adds only unit tests validating query string serialization for uma_resolution_status, with no production code changes.

Overview
Adds targeted query-string unit tests for MarketsRequest to ensure uma_resolution_status is serialized correctly for the supported values (proposed, disputed, resolved) and omitted entirely when not set.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.54%. Comparing base (77264a4) to head (5f16632).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #324   +/-   ##
=======================================
  Coverage   85.54%   85.54%           
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  Files          32       32           
  Lines        5167     5167           
=======================================
  Hits         4420     4420           
  Misses        747      747           

Flag	Coverage Δ
rust	85.54% <ø> (ø)

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