Fix broken Node Nightly CI jobs

[acolytec3]

This removes Node 18 from the Node versions run by the Node Nightly ci jobs (since only 18 is failing and it's been deprecated and we no longer officially support it).

Also rewrites client/test/rpc/websocket.spec.ts so the test should be less flaky.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.28%. Comparing base (020ceec) to head (6e0d84d).
Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	73.20% <ø> (ø)
blockchain	82.92% <ø> (ø)
client	72.91% <ø> (ø)
common	89.82% <ø> (ø)
devp2p	71.18% <ø> (ø)
evm	64.59% <ø> (ø)
genesis	100.00% <ø> (ø)
mpt	51.77% <ø> (+0.03%)	⬆️
rlp	95.11% <ø> (ø)
statemanager	67.05% <ø> (ø)
tx	75.32% <ø> (ø)
util	72.41% <ø> (ø)
vm	57.33% <ø> (ø)
wallet	78.97% <ø> (ø)

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[jochem-brouwer]

CI failed, test-all-browser:

 FAIL   chrome  test/api/muirGlacier/index.spec.ts [ test/api/muirGlacier/index.spec.ts ]
TypeError: Failed to fetch dynamically imported module: http://localhost:63315/home/runner/work/ethereumjs-monorepo/ethereumjs-monorepo/packages/vm/test/api/muirGlacier/index.spec.ts?import&browserv=1737703646589

Client test:

Serialized Error: { errors: [ { stack: 'Error: connect ECONNREFUSED ::1:12345\n    at createConnectionError (node:net:1652:14)\n    at afterConnectMultiple (node:net:1682:16)', message: 'connect ECONNREFUSED ::1:12345', errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: '::1', port: 12345, constructor: 'Function<Error>', name: 'Error', toString: 'Function<toString>' }, { stack: 'Error: connect ECONNREFUSED 127.0.0.1:12345\n    at createConnectionError (node:net:1652:14)\n    at afterConnectMultiple (node:net:1682:16)', message: 'connect ECONNREFUSED 127.0.0.1:12345', errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: '127.0.0.1', port: 12345, constructor: 'Function<Error>', name: 'Error', toString: 'Function<toString>' } ], code: 'ECONNREFUSED' }
This error originated in "test/rpc/websocket.spec.ts" test file. It doesn't mean the error was thrown inside the file itself, but while it was running.
The latest test that might've caused the error is "server without any auth headers". It might mean one of the following:
- The error was thrown, while Vitest was running this test.
- If the error occurred after the test had been completed, this was the last documented test before it was thrown.

[jochem-brouwer]

LGTM, great cleanup on the websocket tests!