test: fix client-certificate tests

[mxschmitt]

We internally use TLSSocket.authorized to check if a client's certificate is valid. If its expired, its not valid anymore. This PR moves the commands from the README.md to the generate.sh and sets the lifetime to 10y.

This fixes tests: npm run ctest client-certificates because the certs were expired.

[yury-s]

Let's add a description to the test file that uses the certificates on when and how the certificates should be regenerated. Or maybe keep the readme and put a short description in it.

[github-actions]

Test results for "tests 1"

9 flaky

⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1079:7 › cli codegen › should not throw csp directive violation errors @firefox-ubuntu-22.04-node18
⚠️ [firefox-page] › page/page-goto.spec.ts:81:3 › should work with Cross-Origin-Opener-Policy @firefox-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node18-1
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node20-1
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node22-1
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node24-1
⚠️ [webkit-library] › library/browsercontext-viewport-mobile.spec.ts:97:5 › mobile viewport › should fire orientationchange event @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

46758 passed, 926 skipped
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Merge workflow run.