test: stop WebIntegrationTests.Versioning asserting an exact structured-log count

[jamescrosswell]

Fixes the recurring Sentry.AspNetCore.Tests.WebIntegrationTests.Versioning snapshot flake on version7.

StructuredLog.Length is _items.Length — the number of structured log items in the envelope batch. In this test that is however many logs ASP.NET Core's own infrastructure happens to emit while serving one request, and they race the flush triggered by server.Dispose(). CI alternates between Length: 7 and Length: 6, so the assertion is nondeterministic by design. Most recently it failed on both linux-arm64 (net8.0) and linux-x64 (net11.0) in a single run.

The fix ignores that one member for this test and regenerates the four WebIntegrationTests.Versioning.DotNet* snapshots (Source: { Length: 7 } → Source: {}). Nothing else in them changes, and all four TFMs regenerated on macOS.

Why not in IgnoreStandardSentryMembers

The issue suggests putting the ignore in the shared test/Sentry.Testing/VerifyExtensions.cs helper, on the basis that "only one committed snapshot contains a Length: line". That turns out not to hold — there are 19:

• 4 × WebIntegrationTests.Versioning.DotNet* (this test)
• 15 across the Serilog, NLog and log4net integration-test projects

In all 19, Length: is the only member inside Source: { }, so it provides no real coverage anywhere. But changing the shared helper would rewrite all 19, including IntegrationTests.Simple.Net4_8.verified.txt and IntegrationTests.Simple.Mono4_0.verified.txt in the Serilog and NLog projects, which can't be regenerated on macOS and would need hand-editing. Only Versioning actually flakes — the other 18 are single-threaded tests with deterministic log counts. Keeping the change local also keeps it clear of the four stacked logging PRs in flight against version7 (#5573, #5585, #5592, #5595).

Ignoring it in the shared helper is still the tidier end state; worth a follow-up alongside a CI-sourced regeneration of the .NET Framework/Mono snapshots.

main does not need this

On main, EnableLogs still defaults to false, so no StructuredLog item reaches this test's envelopes and its snapshots contain no Length: line at all. The count only became load-bearing on version7, where #5504 made logs always enabled. main inherits the fix when version7 merges.

Unrelated to #5617 (msbuild integration-test flush timeout on net9.0 Windows) — different test, different signature.

Closes #5616

#skip-changelog

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Codecov Report

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Additional details and impacted files

@@             Coverage Diff             @@
##             version7    #5638   +/-   ##
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  Coverage            ?   74.75%           
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  Files               ?      515           
  Lines               ?    18905           
  Branches            ?     3689           
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  Hits                ?    14133           
  Misses              ?     3894           
  Partials            ?      878           

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