vmm_tests: updating baselines for UH1.7 and enabling memory validation checks

[dpaliulis-msft]

Establishing baselines for Underhill 1.7 and enabling memory validation checks.

Changes:

• Updated baselines based on latest memory usage data from the Underhill 1.7 fork
• Enabled memory validation checks in the CI/CD pipeline

[Copilot]

Pull Request Overview

This PR establishes updated memory usage baselines for Underhill 1.7 and re-enables previously disabled memory validation checks in the CI/CD pipeline. The memory validation tests were previously disabled to investigate higher memory usage on Intel GP and Intel TDX tests, and this PR resolves that by updating the baselines to reflect the expected memory usage.

• Updated memory usage baselines across all configurations (debug/release builds, multiple architectures, various VP counts)
• Re-enabled four memory validation test functions that verify memory usage against the updated baselines

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
vmm_tests/vmm_tests/tests/tests/multiarch/memstat.rs	Re-enables memory validation checks in four test functions (release_small, debug_small, release_very_heavy, debug_very_heavy) by changing the assert_against_baseline parameter from false to true and removing explanatory comments
vmm_tests/vmm_tests/test_data/memstat_baseline.json	Updates baseline memory metrics across all configurations including usage, reservation, Pss, and Pss_Anon values for different build flavors (debug/release), architectures (aarch64, gp-x64, intel-tdx, amd-snp), and VP counts (2vp, 32vp, 64vp)