Change experimental build to use pl_exp_ variants

Summary:
This allows us to mark targets as manual build and not bazel ignore them.

We need to add a linter to make sure we follow this rule.

Test Plan: bazel test //...

Reviewers: oazizi, michelle, #engineering

Reviewed By: oazizi, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D1122

GitOrigin-RevId: f47fd0d

.bazelignore

@@ -1,7 +1,3 @@
-# If you want to work on experimental you need to delete the following line.
-# Sadly bazel does not seem to provide an easy way to this automatically.
-experimental/
-
 src/ui/node_modules
 vendor
 third_party/bpftrace/build

bazel/cc_resource.bzl

@@ -61,3 +61,8 @@ def pl_cc_resource_impl(
 
     # Create a cc_library with the .o files.
     native.cc_library(name = name, srcs = object_files, tags = tags, linkstatic = 1, **kwargs)
+
+def pl_exp_cc_resource(**kwargs):
+    tags = kwargs.get("tags", [])
+    kwargs["tags"] = tags + ["manual"]
+    pl_cc_resource(**kwargs)

bazel/pl_build_system.bzl

@@ -169,7 +169,7 @@ def pl_cc_test(
         args = [],
         coverage = True,
         local = False):
-    test_lib_tags = []
+    test_lib_tags = list(tags)
     if coverage:
         test_lib_tags.append("coverage_test_lib")
     pl_cc_test_library(
@@ -180,6 +180,7 @@ def pl_cc_test(
         repository = repository,
         tags = test_lib_tags,
     )
+
     native.cc_test(
         name = name,
         copts = pl_copts(repository, test = True),
@@ -254,3 +255,24 @@ def pl_go_library(**kwargs):
         kwargs["clinkopts"] = pl_linkopts()
         kwargs["toolchains"] = ["@bazel_tools//tools/cpp:current_cc_toolchain"]
     go_library(**kwargs)
+
+def append_manual_tag(kwargs):
+    tags = kwargs.get("tags", [])
+    kwargs["tags"] = tags + ["manual"]
+    return kwargs
+
+def pl_exp_cc_binary(**kwargs):
+    kwargs = append_manual_tag(kwargs)
+    pl_cc_binary(**kwargs)
+
+def pl_exp_cc_library(**kwargs):
+    kwargs = append_manual_tag(kwargs)
+    pl_cc_library(**kwargs)
+
+def pl_exp_cc_test(**kwargs):
+    kwargs = append_manual_tag(kwargs)
+    pl_cc_test(**kwargs)
+
+def pl_exp_cc_test_library(**kwargs):
+    kwargs = append_manual_tag(kwargs)
+    pl_cc_test_library(**kwargs)

bazel/proto_compile.bzl

@@ -91,3 +91,8 @@ def pl_go_proto_library(name, proto, importpath, deps = [], **kwargs):
         deps = deps,
         **kwargs
     )
+
+def pl_exp_cc_proto_library(**kwargs):
+    tags = kwargs.get("tags", [])
+    kwargs["tags"] = tags + ["manual"]
+    pl_cc_proto_library(**kwargs)