test: fix flaky conditions for ppc64 SEA tests

[richardlau]

In test status files, $system will be the OS and not the arch (which would be $arch).

Add missing single-executable-application test to the list of tests marked flaky on Linux ppc64le.

Refs: #50828
Refs: #50740

[richardlau]

re. $arch and the confusion in the previous PR's -- it looks like this should match process.arch:

node/tools/test.py

Lines 1676 to 1688 in e0b159e

	archEngineContext=Execute([vm, "-p", "process.arch"], context)
	vmArch=archEngineContext.stdout.rstrip()
	ifarchEngineContext.exit_code!=0orvmArch=="undefined":
	print("Can't determine the arch of: '%s'"%vm)
	print(archEngineContext.stderr.rstrip())
	continue
	env={
	'mode': mode,
	'system': utils.GuessOS(),
	'arch': vmArch,
	'type': get_env_type(vm, options.type, context),
	'asan': get_asan_state(),
	}

which on ppc64le is ppc64:

[iojs@test-osuosl-rhel8-ppc64--le-2 ~]$ ./build/workspace/node-test-commit-plinux/nodes/rhel8-ppc64le/out/Release/node -p process.archppc64[iojs@test-osuosl-rhel8-ppc64--le-2 ~]$

[github-actions]

Fast-track has been requested by @RafaelGSS. Please 👍 to approve.

[richardlau]

FWIW https://ci.nodejs.org/job/node-test-commit-plinux/51647/nodes=rhel8-ppc64le/ is a CI on a temporary branch that is the current v21.6.0-proposal branch with the commit for this PR cherry-picked on top. The six failing single-executable-application tests are marked flaky and the job is overall marked yellow/unstable (as opposed to red/failed).

[mhdawson]

LGTM

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/56734/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/56736/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/56738/

[nodejs-github-bot]

Landed in 273c892