fix(core): task runner parallel should read from taskRunnerOptions

[AgentEnder]

Current Behavior

Any parallel flag from nx.json task runner options is overridden by the default value set in splitNxArgs.

Expected Behavior

The default of 3 is handled by the default task runner options, so its only set to the default of 3 when --parallel is not passed AND it is not set in task runner options

Related Issue(s)

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 2, 2023 7:18pm

[nx-cloud]

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✅ Successfully ran 8 targets

• nx affected -t e2e-macos --parallel=1 --base= --head=
• nx affected --target=e2e --base=8dec11ecbe981d82157473647aa038c85705c680 --head=b47d86c3b4c0295c4985c63aec2e7584606ea347 --parallel=1
• nx affected --target=test --base=8dec11ecbe981d82157473647aa038c85705c680 --head=b47d86c3b4c0295c4985c63aec2e7584606ea347 --parallel=1
• nx affected --target=build --base=8dec11ecbe981d82157473647aa038c85705c680 --head=b47d86c3b4c0295c4985c63aec2e7584606ea347 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=lint --base=8dec11ecbe981d82157473647aa038c85705c680 --head=b47d86c3b4c0295c4985c63aec2e7584606ea347 --parallel=3
• nx-cloud record -- nx format:check --base=8dec11ecbe981d82157473647aa038c85705c680 --head=b47d86c3b4c0295c4985c63aec2e7584606ea347
• nx documentation --no-dte

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[github-actions]

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