Fix CI - updated FT.INFO changes vector_index_sz_mb

[mgravell]

This value is no longer zero, so the test expectation changes; to avoid version hell, just log for now

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Note

Low Risk
Test-only relaxation of a version-sensitive assertion; no production code or API behavior changes.

Overview
Fixes CI failures after FT.INFO started reporting non-zero vector_index_sz_mb (mapped to VectorIndexSzMebibytes).

In four standalone FT.INFO assertion blocks inside SearchTests (Alter/AlterAdd sync and async paths), the hard Assert.Equal(0, info.VectorIndexSzMebibytes) is removed and replaced with log.WriteLine so the value is visible in test output without pinning it to a specific Redis/RediSearch version.

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[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[mgravell]

This perceived server change may be reverted. I'm that case: we'll close this without merge.