Chore: Upgrade ESLint and Stylelint major versions

.stylelintrc

@@ -1,16 +1,19 @@
 {
   "extends": [
-    "stylelint-config-standard",
-    "stylelint-config-prettier"
+    "stylelint-config-standard-scss",
+    "stylelint-config-prettier-scss"
   ],
-  "plugins": [
-    "stylelint-scss"
+  "overrides": [
+    {
+      "files": "{frontend,public}/**/*.less",
+      "customSyntax": "postcss-less"
+    }
   ],
   "rules": {
+    "alpha-value-notation": null,
     "at-rule-no-unknown": null,
-    "scss/at-rule-no-unknown": true,
-    "no-descending-specificity": null,
-    "no-duplicate-selectors": null,
+    "color-function-notation": null,
+    "declaration-block-no-redundant-longhand-properties": null,
     "font-family-no-missing-generic-family-keyword": [
       true,
       {
@@ -19,6 +22,20 @@
           "icomoon"
         ]
       }
-    ]
+    ],
+    "no-descending-specificity": null,
+    "no-duplicate-selectors": null,
+    "property-no-vendor-prefix": null,
+    "rule-empty-line-before": null,
+    "selector-class-pattern": null,
+    "selector-id-pattern": null,
+    "shorthand-property-no-redundant-values": null,
+    "value-no-vendor-prefix": null,
+    "scss/at-import-partial-extension": null,
+    "scss/at-rule-no-unknown": true,
+    "scss/dollar-variable-empty-line-before": null,
+    "scss/dollar-variable-pattern": null,
+    "scss/double-slash-comment-empty-line-before": null,
+    "scss/no-global-function-names": null
   }
 }

frontend/app/assets/stylesheets/archivesspace/form.less

@@ -657,7 +657,7 @@ ul.subrecord-form-list {
   }
 }
 
-//make date help appear inline
+// make date help appear inline
 
 .date-field {
   float: left;

frontend/app/assets/stylesheets/archivesspace/icons.less

@@ -1,5 +1,5 @@
 @font-face {
-  font-family: 'icomoon';
+  font-family: icomoon;
   src: asset-url('icomoon/icomoon.eot?-z7cehr');
   src: asset-url('icomoon/icomoon.eot?#iefix-z7cehr')
       format('embedded-opentype'),

frontend/app/assets/stylesheets/archivesspace/largetree.less

@@ -123,7 +123,6 @@
 
     // Don't change this without also changing largetree.js.erb ->
     // appendWaypoints to match.
-    //
     // We rely on rows having heights known in advance to do our
     // height calculations.
     height: 2em;

frontend/app/assets/stylesheets/archivesspace/mixins.less

@@ -7,7 +7,7 @@
 }
 
 .alt-icomoon() {
-  font-family: 'icomoon';
+  font-family: icomoon;
   margin: 0 4px 0 0;
 }
 

frontend/app/assets/stylesheets/archivesspace/tree.less

@@ -126,6 +126,7 @@
   max-width: 400px;
 }
 
+/* stylelint-disable-next-line at-rule-no-vendor-prefix */
 @-webkit-keyframes spin2 {
   from {
     -webkit-transform: rotate(0deg);