pw_cli: Ignore environment when testing envparse
pw_cli: Ignore environment when testing envparse

Explicitly set error_on_unrecognized=True because the default is to fall
back on the environment which could result in different behavior.

This is needed for pwrev/57502 to pass CQ.

Change-Id: Id2b94ae6370b695b283f825bb57af6caa75b7b6e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/60380
Pigweed-Auto-Submit: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed