RN: Move tools/api to private/cxx-public-api (#51859)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51859

Moves `tools/apis` to `private/cxx-public-api` and cleans up a few things:

- Clean up the `BUCK` file a bit.
- Deduplicate relative paths in scripts.
- Prefix the private package name with `react-native/`.

Changelog:
[Internal]

Reviewed By: huntie

Differential Revision: D76091765

fbshipit-source-id: 6fac7423f9d205085b0b21465f65075a850b61e2

package.json

@@ -40,7 +40,6 @@
   "workspaces": [
     "packages/*",
     "private/*",
-    "tools/*",
     "!packages/helloworld"
   ],
   "devDependencies": {

private/cxx-public-api/check-api.sh

@@ -73,12 +73,13 @@ pushd "$FBSOURCE_ROOT/xplat/js/react-native-github" || exit $ERR_CODE_CANT_FIND_
 trap cleanup EXIT
 
 # TODO: This operates in the sandbox and can't modify files in the repository, which we need for change detection
-# buck2 run //xplat/js/react-native-github/tools/api:public-api
-(cd tools/api && $YARN_BINARY install)
-$NODE_BINARY tools/api/public-api.js
+# buck2 run //xplat/js/react-native-github/private/cxx-public-api:public-api
+REPO_RELATIVE_DIR="private/cxx-public-api"
+(cd "$REPO_RELATIVE_DIR" && $YARN_BINARY install)
+$NODE_BINARY "$REPO_RELATIVE_DIR/public-api.js"
 echo
 
-API_FILE=$(grep -oP '(?<=output=)[^ \n]+' tools/api/public-api.conf)
+API_FILE=$(grep -oP '(?<=output=)[^ \n]+' "$REPO_RELATIVE_DIR/public-api.conf")
 
 API_STATUS=$(hg status --no-status "$API_FILE")
 if [ -z "$API_STATUS" ]; then

private/cxx-public-api/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "public-api",
+  "name": "@react-native/cxx-public-api",
   "version": "0.0.1",
   "description": "Captures the Objective-C / C++ public API of React Native",
   "main": "public-api.js",

private/cxx-public-api/public-api.conf

@@ -22,6 +22,6 @@ packages/react-native/Libraries/WebSocket/*
 packages/react-native/Libraries/Wrapper/Example/*
 
 [settings]
-output=tools/api/ReactNativeCPP.api
+output=private/cxx-public-api/ReactNativeCPP.api
 ; clang=$HOME/some/path/to/clang
 ; clang-format=$HOME/some/path/to/clang-format