perf build: Make pylint build test opt-out (NO_PYLINT=1)

Commit 8a54784e708b ("perf build: Add pylint build tests") added a
compile-time pylint check for Python files in tools/perf, but left it
opt-in via PYLINT=1.

Now that pylint issues across tools/perf/python, tools/perf/pmu-events,
and tools/perf/tests/shell/lib have been cleaned up, enable the pylint
check by default when pylint is installed on the system, with an opt-out
via NO_PYLINT=1 (matching NO_SHELLCHECK=1, NO_MYPY=1, and other perf
build feature flags).

Configure PYTHONPATH in Makefile.perf so pylint resolves perf.pyi type
stubs and pmu-events modules, enable error and warning categories
(--disable=all --enable=E,W --disable=W0123,W0311,W0511,W0603,W0622,W0718
--ignored-modules=textual,setproctitle) appropriate for perf's standalone
CLI and test scripts, and require pylint >= 2.16.0 (skipping with a
warning if an older version is installed).

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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