[FEATURE] Show upload form for extensions in Get Extensions section

This patch adds the upload form to the "Get Extensions" section in the
ExtensionManager.

Change-Id: Id8e698ba0d1c2cc1dddec61bba902d4913e1b01c
Resolves: #51776
Releases: 6.2
Reviewed-on: https://review.typo3.org/23639
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Markus Klein
Tested-by: Markus Klein

typo3/sysext/extensionmanager/Resources/Private/Partials/List/UploadForm.html

+<div class="uploadForm" style="display: none;">
+	<span class="spinner"></span>
+	<f:translate key="extensionList.loading"/>
+</div>
\ No newline at end of file

typo3/sysext/extensionmanager/Resources/Private/Templates/List/Index.html

@@ -13,10 +13,7 @@
 <f:section name="Content">
 	<f:flashMessages renderMode="div" />
 
-	<div class="uploadForm" style="display: none;">
-		<span class="spinner"></span>
-		<f:translate key="extensionList.loading"/>
-	</div>
+	<f:render partial="List/UploadForm" />
 
 	<div class="headerRow ui-helper-clearfix">
 		<div class="typo3-extensionmanager-headerRowLeft">

typo3/sysext/extensionmanager/Resources/Private/Templates/List/Ter.html

@@ -3,6 +3,7 @@
 <f:layout name="main"/>
 
 <f:section name="docheader-buttons">
+	<f:be.buttons.icon uri="{f:uri.action(action:'form',controller:'UploadExtensionFile')}" icon="actions-edit-upload" title="{f:translate(key:'extensionList.uploadExtension')}"/>
 </f:section>
 
 <f:section name="module-headline">
@@ -10,6 +11,9 @@
 </f:section>
 
 <f:section name="Content">
+
+	<f:render partial="List/UploadForm" />
+
 	<div class="headerRow ui-helper-clearfix">
 		<div class="typo3-extensionmanager-headerRowLeft">
 			<f:form class="typo3-extensionmanager-searchTerForm" action="ter">