Fix flaky E2E network list test assertion

[beena352]

Summary of the Pull Request

Remove the exact-count assertion VERIFY_ARE_EQUAL(2U, networks.size()) in WSLCE2E_Network_List_JsonFormat that intermittently fails when other E2E test classes leak wslc-managed networks into the shared session.

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

The WSLCE2E_Network_List_JsonFormat test creates two networks and then asserts that network list --format json returns exactly 2 entries. This is fragile because:

• ListNetworks returns all wslc-managed networks in the session, not just this test's.
• If a prior test class (e.g. ContainerCreate, ContainerRun, Inspect) fails mid-body and leaks a network, the count becomes 3+.
• The test is non-deterministically ordered relative to those other classes.

The fix removes only the exact-count check. The test still verifies both expected networks are present by name via std::find, which is the same pattern the sibling test WSLCE2E_Network_List_QuietOption_OutputsNamesOnly already uses correctly.

Validation Steps Performed

Verified the test passes locally with the fix applied

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Pull request overview

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[OneBlue]

Do we know where the leak is coming from ? Ideally we should fix the leak so this doesn't potentially cause other failures