test: increase coreFraction in e2e tests

[universal-itengineer]

Description

Increase CPU coreFraction allocation and fix resource cleanup in e2e tests to improve test stability.

Changes

1. Increase coreFraction in e2e tests (test/e2e/blockdevice/data_exports.go, test/e2e/vm/configuration.go, test/e2e/vm/sizing_policy.go, test/e2e/vmop/restore.go):

   • Changed coreFraction from 5% to 50-100% for resource-intensive tests

2. Increase coreFraction in legacy e2e tests (test/e2e/legacy/testdata/*):

   • Changed coreFraction from 5% to 50% (100% for vm-disk-attachment, 20% for vm-migration)
   • Affected 11 test data files

3. Fix cleanup in ComplexTest (test/e2e/legacy/complex.go):

   • Moved resource deletion from Context/It block to AfterAll hook
   • Ensures test resources are cleaned up even if tests fail

Why do we need it, and what problem does it solve?

E2e tests with low coreFraction (5%) are flaky and fail intermittently due to insufficient CPU resources, especially in CI environments with resource contention. Additionally, the cleanup logic in ComplexTest was placed inside a test step, causing test resources to remain in the cluster if tests failed before reaching that step.

What is the expected result?

• More stable e2e tests with consistent CPU allocation
• Guaranteed cleanup of test resources after ComplexTest completion, regardless of test outcome

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: test
type: fix
summary: Increase coreFraction allocation in e2e tests for better stability.
impact_level: low

section: test
type: fix
summary: Fix ComplexTest resource cleanup by using AfterAll hook instead of Context/It block.
impact_level: low