Redesign resource tree (#1865)

* start redesign work

* add left padding to all tree nodes

* fiddling with padding

* align tab bar line with first item in resource tree

* final touch ups

* fix a strange password manager autofill prompt

* add keyboard shortcuts

* revert testing change

* nudge messagebar to layout row height

* tidy up

* switch to Allotment to stop ResizeObserver issues with monaco

* refmt and fix lints

* fabric touch-ups

* update snapshots

* remove explicit react-icons dependency

* reinstall packages

* remove background from FluentProvider

* fix alignment of message bar

* undo temporary workaround

* restore refresh button

* fix e2e tests and reformat

* fix compiler error

* remove uiw/react-split

* uncomment selection change on expand

less/documentDB.less

@@ -1906,7 +1906,7 @@ input::-webkit-calendar-picker-indicator::after {
 }
 
 .nav-tabs-margin {
-  padding-top: 8px;
+  padding-top: 5px;
   background-color: #f2f2f2;
 }
 
@@ -2074,14 +2074,6 @@ a:link {
   display: inline;
 }
 
-.resourceTreeAndTabs {
-  display: flex;
-  flex: 1 1 auto;
-  overflow-x: clip;
-  overflow-y: auto;
-  height: 100%;
-}
-
 .collectiontitle {
   font-size: 14px;
   text-transform: uppercase;
@@ -2325,11 +2317,6 @@ td a:hover {
   outline: 1px dotted;
 }
 
-#content.active .tabdocuments .scrollable {
-  height: 100%;
-  overflow-y: auto;
-}
-
 .table-fixed thead {
   width: 97%;
   padding-left: 18px;
@@ -2365,10 +2352,8 @@ a:link {
 
 .tabsManagerContainer {
   height: 100%;
-  flex-grow: 1;
-  display: flex;
-  flex-direction: column;
-  min-height: 300px;
+  display: grid;
+  grid-template-rows: 36px 36px 1fr;
   min-width: 0; // This prevents it to grow past the parent's width if its content is too wide
 }
 
@@ -2580,18 +2565,6 @@ a:link {
   cursor: pointer;
 }
 
-.documentsTab {
-  .documentsTable {
-    .documentsTableCell {
-      border-left: 1px solid @BaseMedium;
-      height: 100%;
-    }
-    .documentsTableHeader {
-      border-bottom: 1px solid @BaseMedium;
-    }
-  }
-}
-
 .querydropdown {
   border: 1px solid @BaseMedium;
   font-style: normal;
@@ -2637,6 +2610,7 @@ a:link {
 }
 
 .tabPanesContainer {
+  grid-row: span 2; // Fill the remaining space
   display: flex;
   height: 100%;
   overflow: hidden;