Dedupe kokoro builds (#10400)

* Attempt to dedupe Bazel test

* Intentionally break a test to make sure presubmits still run

* Moving some shared configs to higher directories

* Adding root common.cfg

* Adding action cfgs at root directory

* Adding empty presubmit/continuous

* Going back to leaf directories

* Adding empty presubmit/continuous

* Unify continuous and presubmit configs

* Consolidate all presubmit/continuous into a common config file

* Revert "Intentionally break a test to make sure presubmits still run"

This reverts commit 978eb19f80ea46f4a0e07789f86e791c5f9790ac.

* Fixing POC config files

kokoro/linux/java_jdk17/presubmit.cfg

diff --git a/kokoro/linux/java_jdk17/presubmit.cfg b/kokoro/linux/java_jdk17/presubmit.cfg
index 4574a0f..8523c22 100644
--- a/kokoro/linux/java_jdk17/presubmit.cfg
+++ b/kokoro/linux/java_jdk17/presubmit.cfg
@@ -1,21 +1 @@
-# Config file for running Linkage Monitor in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/bazel.sh"
-timeout_mins: 120
-
-env_vars {
-  key: "CONTAINER_IMAGE"
-  value: "gcr.io/protobuf-build/java/linux:17-64e8944e4f18d7d6c9649112a8a93be57e693cd8"
-}
-
-env_vars {
-  key: "BAZEL_TARGETS"
-  value: "//java/..."
-}
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.*"
-  }
-}
+# Keep this file empty! Use common.cfg instead.