fix(core): allow postTaskExecution hook without preTaskExecution hook (…

…#29820)

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## Current Behavior
<!-- This is the behavior we have today -->

`postTaskExecution` hook is only called if `preTaskExecution` hook is
exported in the plugin.

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->

`postTaskExecution` hook should be independent from `preTaskExecution`
hook. I.e., if `preTaskExecution` hook is not exported,
`postTaskExecution` hook should still be called after a task execution.

## Related Issue(s)
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merged. -->

Fixes #

Fixed `postTaskExecution` hook

Co-authored-by: Jonathan Cammisuli <[email protected]>

packages/nx/src/project-graph/plugins/loaded-nx-plugin.ts

@@ -143,11 +143,11 @@ export class LoadedNxPlugin {
         }
         return updates;
       };
+    }
 
-      if (plugin.postTasksExecution) {
-        this.postTasksExecution = async (context: PostTasksExecutionContext) =>
-          plugin.postTasksExecution(this.options, context);
-      }
+    if (plugin.postTasksExecution) {
+      this.postTasksExecution = async (context: PostTasksExecutionContext) =>
+        plugin.postTasksExecution(this.options, context);
     }
   }
 }