Remove parallelism from pylint runs in tox

Move `posargs` from black to pylint for the tox lint commands so that
pylint parallelism can be opted into.

tox.ini

@@ -51,8 +51,8 @@ commands = stestr run {posargs}
 [testenv:lint]
 envdir = .tox/lint
 commands =
-  black --check {posargs} qiskit_experiments test tools setup.py
-  pylint -rn -j 0 --rcfile={toxinidir}/.pylintrc qiskit_experiments/ test/ tools/
+  black --check qiskit_experiments test tools setup.py
+  pylint -rn {posargs} --rcfile={toxinidir}/.pylintrc qiskit_experiments/ test/ tools/
   python {toxinidir}/tools/verify_headers.py
 
 [testenv:lint-incr]
@@ -62,7 +62,7 @@ allowlist_externals = git
 commands =
   black --check {posargs} qiskit_experiments test tools setup.py
   -git fetch -q https://github.com/Qiskit-Extensions/qiskit-experiments :lint_incr_latest
-  python {toxinidir}/tools/pylint_incr.py -rn -j4 -sn --paths :/qiskit_experiments/*.py :/test/*.py :/tools/*.py
+  python {toxinidir}/tools/pylint_incr.py -rn {posargs} -sn --paths :/qiskit_experiments/*.py :/test/*.py :/tools/*.py
   python {toxinidir}/tools/verify_headers.py qiskit_experiments test tools
 
 [testenv:black]
@@ -105,4 +105,4 @@ commands =
 skip_install = true
 deps =
 allowlist_externals = rm
-commands = rm -rf {toxinidir}/docs/stubs/ {toxinidir}/docs/_build
+commands = rm -rf {toxinidir}/docs/stubs/ {toxinidir}/docs/_build