[config] Delete platform_version.json

This is no longer the source of truth, and is replaced by
version_history.json.

Change-Id: I5b7e1ed02b72ca753f793322a6e96f46046d9dc8
Reviewed-on: https://fuchsia-review.googlesource.com/c/infra/roller-tests/integration/+/885574
Commit-Queue: Anthony Fandrianto <atyfto@google.com>
Reviewed-by: Danielle Kay <danikay@google.com>
diff --git a/infra/config/common/platform_version.json b/infra/config/common/platform_version.json
deleted file mode 100644
index 9df3296..0000000
--- a/infra/config/common/platform_version.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-    "in_development_api_level": 3,
-    "supported_fuchsia_api_levels": [
-        1,
-        2
-    ]
-}