[ADR-0006][AC-319] Migrate all tests to use jest mock instead of substitute (#6520)

Standardize on using jest mock instead of having two mocking frameworks which can be confusing.

package-lock.json

@@ -79,7 +79,6 @@
         "@compodoc/compodoc": "1.1.21",
         "@electron/notarize": "1.2.4",
         "@electron/rebuild": "3.2.13",
-        "@fluffy-spoon/substitute": "1.208.0",
         "@ngtools/webpack": "15.2.9",
         "@storybook/addon-a11y": "7.3.0",
         "@storybook/addon-actions": "7.3.0",
@@ -6011,19 +6010,6 @@
       "integrity": "sha512-m0G6wlnhm/AX0H12IOWtK8gASEMffnX08RtKkCgTdHb9JpHKGloI7icFfLg9ZmQeavcvR0PKmzxClyuFPSjKWw==",
       "dev": true
     },
-    "node_modules/@fluffy-spoon/substitute": {
-      "version": "1.208.0",
-      "resolved": "https://registry.npmjs.org/@fluffy-spoon/substitute/-/substitute-1.208.0.tgz",
-      "integrity": "sha512-BU5vKRoK4OYlKzDtyg4HbtWnUNLOvV0ntqEZIphz+mq2G0HlVFywwJ7M+FbIcnJVDbUReS01FyL5x8R01r7zBg==",
-      "dev": true,
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/substitute-js#section-contribute"
-      }
-    },
     "node_modules/@foliojs-fork/fontkit": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/@foliojs-fork/fontkit/-/fontkit-1.9.1.tgz",