devops: install pnpm and yarn for secondary installation tests

[dgozman]

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[github-actions]

Test results for "tests 1"

6 flaky
⚠️ [chromium] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [chromium] › page/page-event-request.spec.ts:101:3 › should report navigation requests and responses handled by service worker
⚠️ [chromium] › library/capabilities.spec.ts:139:3 › should not crash on showDirectoryPicker
⚠️ [chromium] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [chromium] › page/page-event-request.spec.ts:101:3 › should report navigation requests and responses handled by service worker
⚠️ [webkit] › library/inspector/cli-codegen-pytest.spec.ts:32:5 › should print the correct context options when using a device and lang

1 interrupted
⚠️ [installation tests] › validate-dependencies.spec.ts:26:7 › validate dependencies › disabled (off)

25339 passed, 590 skipped
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Merge workflow run.