perf pmu-events: Clean up mypy and pylint issues

Clean up mypy type errors and pylint warnings across the pmu-events Python
scripts (amd_metrics.py, intel_metrics.py, jevents.py,
make_legacy_cache.py,
and metric.py) in preparation for making MYPY and PYLINT build tests
opt-out.

In addition to type annotations and unused import/variable cleanups, fix
three bugs in intel_metrics.py exposed by static analysis:
- Fix references to undefined 'args.model' (instead of '_args.model')
  inside
  try/except blocks in IntelL2() and UncoreMemBw(), which previously threw
  NameError and silently disabled Skylake/CascadeLake L2 silent eviction
  adjustments and uncore memory bandwidth JSON loading.
- Define DC_WB_U and DC_WB_D before their first use in IntelL2(), fixing
  an UnboundLocalError that silently dropped the l2_out_rate, wbn, and isd
  metrics.
- Fix Event-to-string comparison and addition in IntelFp() by comparing
  and modifying 'f_assist.name' instead of the Event object 'f_assist'.

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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