fix(core): skip defer timers on the server (angular#55480)

Adds a check that disables the timer scheduling for `placeholder` and `loading` blocks on the server since the underlying timer will delay the server response. Fixes angular#55475. PR Close angular#55480

Author: crisbeto

packages/core/src/defer/instructions.ts

@@ -480,8 +480,10 @@ export function renderDeferBlockState(
 
  if (isValidStateChange(currentState, newState) &&
  isValidStateChange(lDetails[NEXT_DEFER_BLOCK_STATE] ?? -1, newState)) {
+ const injector = hostLView[INJECTOR]!;
  const tDetails = getTDeferBlockDetails(hostTView, tNode);
- const needsScheduling = !skipTimerScheduling &&
+ // Skips scheduling on the server since it can delay the server response.
+ const needsScheduling = !skipTimerScheduling && isPlatformBrowser(injector) &&
  (getLoadingBlockAfter(tDetails) !== null ||
  getMinimumDurationForState(tDetails, DeferBlockState.Loading) !== null ||
  getMinimumDurationForState(tDetails, DeferBlockState.Placeholder));

packages/core/test/bundling/defer/bundle.golden_symbols.json

@@ -2096,6 +2096,9 @@
  {
  "name": "isNodeMatchingSelectorList"
  },
+ {
+ "name": "isPlatformBrowser"
+ },
  {
  "name": "isPlatformServer"
  },