Add compareDocumentPosition to fragment instances (facebook#32722)

This adds `compareDocumentPosition(otherNode)` to fragment instances.

The semantics implemented are meant to match typical element
positioning, with some fragment specifics. See the unit tests for all
expectations.

- An element preceding a fragment is `Node.DOCUMENT_POSITION_PRECEDING`
- An element after a fragment is `Node.DOCUMENT_POSITION_FOLLOWING`
- An element containing the fragment is
`Node.DOCUMENT_POSITION_PRECEDING` and
`Node.DOCUMENT_POSITION_CONTAINING`
- An element within the fragment is
`Node.DOCUMENT_POSITION_CONTAINED_BY`
- An element compared against an empty fragment will result in
`Node.DOCUMENT_POSITION_DISCONNECTED` and
`Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC`

Since we assume a fragment instances target children are DOM siblings
and we want to compare the full fragment as a pseudo container, we can
compare against the first target child outside of handling the special
cases (empty fragments and contained elements).

DiffTrain build for [e5a8de8](facebook@e5a8de8)

Author: pull[bot]

compiled/facebook-www/REVISION

@@ -1 +1 @@
-54a50729cc47a884c2110d7c59dd5f850748e142
+e5a8de81e57181692d33ce916dfd6aa23638ec92

compiled/facebook-www/REVISION_TRANSFORMS

@@ -1 +1 @@
-54a50729cc47a884c2110d7c59dd5f850748e142
+e5a8de81e57181692d33ce916dfd6aa23638ec92

compiled/facebook-www/React-dev.classic.js

@@ -1538,7 +1538,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.2.0-www-classic-54a50729-20250506";
+    exports.version = "19.2.0-www-classic-e5a8de81-20250506";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-dev.modern.js

@@ -1538,7 +1538,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.2.0-www-modern-54a50729-20250506";
+    exports.version = "19.2.0-www-modern-e5a8de81-20250506";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-prod.classic.js

@@ -636,4 +636,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.2.0-www-classic-54a50729-20250506";
+exports.version = "19.2.0-www-classic-e5a8de81-20250506";

compiled/facebook-www/React-prod.modern.js

@@ -636,4 +636,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.2.0-www-modern-54a50729-20250506";
+exports.version = "19.2.0-www-modern-e5a8de81-20250506";

compiled/facebook-www/React-profiling.classic.js

@@ -640,7 +640,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.2.0-www-classic-54a50729-20250506";
+exports.version = "19.2.0-www-classic-e5a8de81-20250506";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-profiling.modern.js

@@ -640,7 +640,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.2.0-www-modern-54a50729-20250506";
+exports.version = "19.2.0-www-modern-e5a8de81-20250506";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&