[roll third_party/pigweed] pw_tls_client: Relocate test logic

Move test_server, test data generation from third_party/boringssl back
to pw_tls_client to avoid awkward dependencies.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/54240

third_party/pigweed Rolled-Commits: 32988e0ba004ca4..79174155bab2dc9
Roller-URL: https://ci.chromium.org/b/8840529997576415568
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8840529997576415568
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Icf472cfca8b30ea7773fd642d0bf5d25b3872e05
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/54824
Reviewed-by: 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>
diff --git a/third_party/pigweed b/third_party/pigweed
index 32988e0..7917415 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 32988e0ba004ca4ad344b9e6095385c2d9d152e3
+Subproject commit 79174155bab2dc90fedc55916613a9b4cca696c1