chore(ci): run e2e tests in parallel

[janisz]

Description

Speedup e2e tests by running in parallel and optimising cache key.

Validation

CI

[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
361	2	359	12

View the full list of 2 ❄️ flaky test(s)

::policy 1

Flake rate in main: 100.00% (Passed 0 times, Failed 26 times)

Stack Traces | 0s run time

- test violation 1
- test violation 2
- test violation 3

::policy 4

Flake rate in main: 100.00% (Passed 0 times, Failed 26 times)

Stack Traces | 0s run time

- testing multiple alert violation messages 1
- testing multiple alert violation messages 2
- testing multiple alert violation messages 3

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[github-actions]

E2E Test Results

Commit: 764b2a9
Workflow Run: View Details
Artifacts: Download test results & logs

=== Evaluation Summary ===

  ✓ cve-detected-workloads (assertions: 3/3)
  ✓ cve-cluster-does-exist (assertions: 3/3)
  ✓ cve-cluster-does-not-exist (assertions: 3/3)
  ✗ cve-nonexistent (assertions: 3/3)
      one or more verification steps failed
  ✓ list-clusters (assertions: 3/3)
  ✗ cve-multiple (assertions: 2/3)
      one or more verification steps failed
      - ToolsUsed: Required tool not called: server=stackrox-mcp, tool=, pattern=get_deployments_for_cve
  ✓ cve-clusters-general (assertions: 3/3)
  ✓ cve-detected-clusters (assertions: 3/3)
  ✓ cve-log4shell (assertions: 3/3)
  ✓ cve-cluster-list (assertions: 3/3)
  ✓ rhsa-not-supported (assertions: 2/2)

Tasks:      9/11 passed (81.82%)
Assertions: 31/32 passed (96.88%)
Tokens:     ~54058 (estimate - excludes system prompt & cache)
MCP schemas: ~12738 (included in token total)
Agent used tokens:
  Input:  14662 tokens
  Output: 20964 tokens
Judge used tokens:
  Input:  60796 tokens
  Output: 51416 tokens

[janisz]

It's blocked by:

• Race condition in MCP client causes nil pointer panic during parallel execution mcpchecker/mcpchecker#259