test(milvus): cast exposed_port to str for substring assert

[Tranquility2]

Problem

test_run_milvus_success asserts:

asserturlandexposed_portinurl

get_exposed_port() returns int, so the in check against a string url raises:

TypeError: 'in <string>' requires string as left operand, not int

CI evidence: test (3.10|3.13|3.14, milvus) jobs fail this assertion for both v2.4.0 and v2.4.4.

Fix

Cast exposed_port to str before the substring check.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.12%. Comparing base (be4c857) to head (a7df3d7).

Additional details and impacted files

@@ Coverage Diff @@## main #1035 +/- ##
==========================================
- Coverage 83.29% 83.12% -0.18% 
==========================================
Files 16 16 Lines 1754 1754 Branches 193 193 ==========================================
- Hits 1461 1458 -3 - Misses 236 240 +4 + Partials 57 56 -1 

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[Tranquility2]

Superseded by the src-layout migration (#1045) and subsequent test fixes on main.
tests/community/milvus/test_milvus.py already does assert str(exposed_port) in url, which is the same fix proposed here.
Closing.