pw_presubmit: Add static_analysis to combined step
pw_presubmit: Add static_analysis to combined step

Add the static_analysis ninja target to the gn_combined_build_check
presubmit step.

Bug: b/243380637
Change-Id: I2af79d1205ca8e457aee19df1d71b448af859c62
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/107930
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Commit-Queue: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>

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