[repo-assist] scriptgen integration tests fail due to unpinned NuGet versions in scenario fixtures

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The TestCategory=scriptgen integration tests in LoadingScriptGenerationTests.fs currently fail when run against a live NuGet feed, as seen in CI attempts for PR #4396.

Root cause: The scenario fixtures under integrationtests/scenarios/loading-scripts/*/before/paket.dependencies (e.g. simple-dependencies, mscorlib) use unpinned version ranges (nuget NUnit ~> 2, nuget log4net ~> 1, etc.) and ship no paket.lock. When paket install runs, it resolves whatever the latest matching package versions are on nuget.org today. Several of those packages have since changed their lib/ folder layout (NUnit, log4net, Microsoft.Rest.ClientRuntime.Azure), so the generated load-script logic can't find expected DLL paths (DirectoryNotFoundException), and the tests' hard-coded expected file lists no longer match reality.

This is pre-existing test fixture rot, unrelated to any recent Paket code change — the same failures reproduce on old commits with a fresh package resolution.

Suggested fix: pin exact package versions (or add a maintained paket.lock) for the affected loading-scripts scenarios, and refresh the expected script/file assertions to match current package contents.

I've disabled the newly-added linux-integration-scriptgen CI job in PR #4396's follow-up so CI is green again; re-enable it once these fixtures are repaired.
Related to #4396

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Start with the TestCategory=scriptgen tests in LoadingScriptGenerationTests.fs and inspect the paket.dependencies files under integrationtests/scenarios/loading-scripts/*/before, especially simple-dependencies and mscorlib. Run the integration tests against the live feed to identify affected package contents. Done means the fixtures use reproducible package versions, expected script/file assertions match them, and the disabled linux-integration-scriptgen CI job can be re-enabled.