Fix "strength" relevant typos in core

Problem/Motivation

Discovered at #2972224: Add .cspell.json to automate spellchecking in Drupal core, and pointed by @xjm in https://www.drupal.org/project/drupal/issues/3122088#comment-13628724

+++ b/core/.cspell.json
@@ -0,0 +1,1288 @@
+      "strenght",

Proposed resolution

@xjm: "strength".

As title and see the change record https://www.drupal.org/node/3122084 for how to work with cspell.

Remaining tasks

Pick out all applicable words from #2972224: Add .cspell.json to automate spellchecking in Drupal core and fix them.

User interface changes

API changes

Data model changes

Release notes snippet