test: move common.PORT debug tests to sequential

[gibfahn]

They tend to hang if they happen to run in parallel with another test that uses common.PORT.

I missed these when looking at #13580, looks like two of these tests were competing with each other in the last run I did.

I've done a diff against the list in #12376, and these are the parallel debugger tests that contain common.PORT and are no longer in master:

• test-debug-brk-no-arg.js
• test-debug-brk.js (test: move test-debug-brk to sequential #13580)
• test-debug-no-context.js
• test-debug-port-cluster.js
• test-debug-port-from-cmdline.js
• test-debug-port-numbers.js
• test-debug-signal-cluster.js
• test-debugger-util-regression.js

grep results:

➜  parallel git:(v6.x-staging) ❯ rg common.PORT `fnd test-debug`                                        ~/wrk/com/node/test/parallel
test-debug-no-context.js
7:const args = ['--debug', `--debug-port=${common.PORT}`, '--interactive'];

test-debug-brk-no-arg.js
6:const child = spawn(process.execPath, ['--debug-brk=' + common.PORT, '-i']);

test-debug-port-cluster.js
6:const PORT_MIN = common.PORT + 1;  // The fixture uses common.PORT.

test-debug-signal-cluster.js
8:const port = common.PORT;

test-debug-brk.js
18:    const procArgs = [`--debug-brk=${common.PORT}`].concat(extraArgs);
25:        const agentArgs = ['debug', `localhost:${common.PORT}`];

test-debug-port-from-cmdline.js
6:const debugPort = common.PORT;

test-debug-port-numbers.js
16:  const port = common.PORT + i;

test-debugger-util-regression.js
16:  `--port=${common.PORT}`,

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

test

[gibfahn]

Interested to hear any other method of solving this. I don't think we need to worry too much about these, they'll go away when 6.x goes away. Just trying to avoid any more flakes in CI.

Failures that prompted this:

not ok 920 parallel/test-debug-signal-cluster
  ---
  duration_ms: 60.14
  severity: fail
  stack: |-
    timeout
  ...

not ok 900 parallel/test-debug-brk
  ---
  duration_ms: 60.109
  severity: fail
  stack: |-
    timeout
  ...

[Trott]

LGTM

[gibfahn]

Landed in 7a22964