ci(release): un-ignore tauri.conf.json + fix updater-json input

- tauri-action globs for tauri.conf.json honoring .gitignore; the global
  *.json rule hid it (force-added but still ignore-matched), so detection
  failed with 'Failed to resolve Tauri path' and it tried to re-init.
  Negate it like the cuda overlay already is.
- rename uploadUpdaterJson -> includeUpdaterJson (valid v0.6.2 input).

.gitignore

@@ -40,5 +40,9 @@ dist-ssr
 # locally; ~600 MB, never committed). See RELEASE_PLAN.md "CUDA release variant".
 src-tauri/cuda-redist/
 
-# Keep the CUDA build config overlay tracked despite the *.json rule above.
+# Keep the Tauri configs tracked despite the *.json rule above. tauri.conf.json
+# must also be un-ignored so tauri-action can find it: it globs for the config
+# honoring .gitignore, and an ignored config makes the release build fail with
+# "Failed to resolve Tauri path".
+!src-tauri/tauri.conf.json
 !src-tauri/tauri.cuda.conf.json