test: mark some flakes

parallel:

• https://github.com/nodejs/node/issues/23207 test-net-connect-options-port: PASS,FLAKY

sequential:

• https://github.com/nodejs/node/issues/23066 test-gc-http-client-timeout: PASS, FLAKY
• https://github.com/nodejs/node/issues/22336 test-gc-http-client: PASS,FLAKY
• https://github.com/nodejs/node/issues/23067 test-gc-net-timeout: PASS,FLAKY
• https://github.com/nodejs/node/issues/23089 test-gc-http-client-onerror: PASS,FLAKY
• https://github.com/nodejs/node/issues/23219 test-gc-http-client-connaborted: PASS,FLAKY

and update some references

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines