[roll third_party/pigweed] pw_unit_test: Prevent duplicate test suites

- Test suites must be unique between TEST and TEST_F declarations in
  GoogleTest. Prevent duplicate declarations (at least within one file)
  in pw_unit_test by declaring functions with incompatible signatures
  from TEST and TEST_F.
- Fix assert_facade_test.cc, which violated this rule.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/95721

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 8a4b9201a856a8b..fd550368c85a54b
Roller-URL: https://ci.chromium.org/b/8813253189143955553
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8813253189143955553
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I79f2c59f7a91e2996b83a22fa21a61e69aa57a74
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/95838
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
1 file changed