chore: upgrade eslint rules + dependencies (#2731)

update to the latest msgraph eslint config
fix a number of issues now treated as errors
improved typing in many areas reducing the number of explicit any type references

Author: gavinbarron

.eslintrc.js

@@ -28,7 +28,8 @@ module.exports = {
   root: true,
   ignorePatterns: ['**/**-css.ts', '.eslintrc.js', '*.cjs'],
   rules: {
-    '@typescript-eslint/prefer-optional-chain': 'warn',
-    'newline-per-chained-call': 'off'
+    '@typescript-eslint/no-explicit-any': 'warn',
+    // prefer-nullish-coalescing requires strictNullChecking to be turned on
+    '@typescript-eslint/prefer-nullish-coalescing': 'off'
   }
 };

.vscode/settings.json

@@ -18,5 +18,6 @@
   },
   "stylelint.packageManager": "yarn",
   "stylelint.snippet": ["css", "less", "postcss", "scss"],
-  "stylelint.validate": ["css", "less", "postcss", "scss"]
+  "stylelint.validate": ["css", "less", "postcss", "scss"],
+  "cSpell.words": ["mailenabledsecurity"]
 }