[ci] Fix nightly regression failures in caliptra and veer

The GitHub nightly workflow was failing due to issues with //third_party
annd //target/veer targets:

1. Embedded caliptra embedded targets are not compatible with the host
   tag wildcard. Update embedded targets to skip host build.

2. measure_syscall_latency_emulator_test and ipc_runner_emulator_test
   collided on caliptra_runner.py's hardcoded --i3c-port=65534.
   Add the `exclusive` tag to ipc_runner_emulator_test.

3. measure_syscall_latency_emulator_test triggers a pw_kernel terminal
   exception in kernel mode (mcause=1, epc=0) on process exit. Disabling
   the test until the issue is addressed.

Signed-off-by: Miguel Osorio <miguelosorio@google.com>

target/veer/ipc/user/BUILD.bazel

diff --git a/target/veer/ipc/user/BUILD.bazel b/target/veer/ipc/user/BUILD.bazel
index 6aba08b..f277bc7 100644
--- a/target/veer/ipc/user/BUILD.bazel
+++ b/target/veer/ipc/user/BUILD.bazel
@@ -76,6 +76,11 @@
     name = "ipc_runner_emulator_test",
     timeout = "long",
     interface = "emulator",
-    tags = ["emulator"],
+    # caliptra_runner.py hardcodes --i3c-port=65534, so caliptra emulator
+    # tests cannot run in parallel without an EADDRINUSE collision.
+    tags = [
+        "emulator",
+        "exclusive",
+    ],
     target = ":ipc",
 )

target/veer/syscall_latency/BUILD.bazel

diff --git a/target/veer/syscall_latency/BUILD.bazel b/target/veer/syscall_latency/BUILD.bazel
index 186c95a..3458c54 100644
--- a/target/veer/syscall_latency/BUILD.bazel
+++ b/target/veer/syscall_latency/BUILD.bazel
@@ -105,9 +105,13 @@
     name = "measure_syscall_latency_emulator_test",
     timeout = "long",
     interface = "emulator",
+    # DISABLED: this test hits a pw_kernel terminal exception in kernel mode
+    # (mcause=1, epc=0) on process exit.
+    #
     # caliptra_runner.py hardcodes --i3c-port=65534, so caliptra emulator
     # tests cannot run in parallel without an EADDRINUSE collision.
     tags = [
+        "disabled",
         "emulator",
         "exclusive",
     ],

third_party/caliptra/caliptra-mcu-sw/BUILD.bazel

diff --git a/third_party/caliptra/caliptra-mcu-sw/BUILD.bazel b/third_party/caliptra/caliptra-mcu-sw/BUILD.bazel
index 45a8a02..f407647 100644
--- a/third_party/caliptra/caliptra-mcu-sw/BUILD.bazel
+++ b/third_party/caliptra/caliptra-mcu-sw/BUILD.bazel
@@ -209,6 +209,7 @@
     crate_root = "@caliptra_mcu_sw//:romtime/src/lib.rs",
     edition = "2021",
     rustc_flags = ["--cap-lints=allow"],
+    target_compatible_with = ["//third_party/caliptra/platforms:target_caliptra"],
     deps = [
         "//third_party/caliptra:crate_registers-generated",
         "//third_party/caliptra:crate_tock-registers",

third_party/caliptra/caliptra-sw/BUILD.bazel

diff --git a/third_party/caliptra/caliptra-sw/BUILD.bazel b/third_party/caliptra/caliptra-sw/BUILD.bazel
index df18049..5006aa3 100644
--- a/third_party/caliptra/caliptra-sw/BUILD.bazel
+++ b/third_party/caliptra/caliptra-sw/BUILD.bazel
@@ -226,6 +226,7 @@
         "@rust_caliptra_crates//:caliptra-cfi-derive",
     ],
     rustc_flags = ["--cap-lints=allow"],
+    target_compatible_with = ["//third_party/caliptra/platforms:target_caliptra"],
     deps = [
         ":caliptra_cfi_lib",
         "//third_party/caliptra:crate_bitfield",