chore: Decouple gemini_docs from gemini_docfx in docs-presubmit

PiperOrigin-RevId: 933838888

Author: matthew29tang

.kokoro/continuous/gemini_docfx.cfg

@@ -0,0 +1,28 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "STAGING_BUCKET"
+    value: "gcloud-python-test"
+}
+
+env_vars: {
+    key: "V2_STAGING_BUCKET"
+    value: "gcloud-python-test"
+}
+
+# We only upload the image in the main `docs` build.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE_UPLOAD"
+    value: "false"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-aiplatform/.kokoro/build.sh"
+}
+
+# Only run this nox session.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "gemini_docfx"
+}

.kokoro/docs/docs-presubmit.cfg

@@ -24,5 +24,5 @@ env_vars: {
 # Only run this nox session.
 env_vars: {
     key: "NOX_SESSION"
-    value: "gemini_docs gemini_docfx"
+    value: "gemini_docs"
 }