Properties 7.9 branch: remove the upgrades for the properties plugin and improve bootstrap content

upgraders can/should be removed and bootstrap content like below should be merged and marked with reload on startup

<sv:node sv:name="properties-queries-templates-new-properties-document">
<sv:property sv:name="jcr:primaryType" sv:type="Name">
<sv:value>hippo:initializeitem</sv:value>
</sv:property>
<sv:property sv:name="hippo:sequence" sv:type="Double">
<sv:value>20104</sv:value>
</sv:property>
<sv:property sv:name="hippo:contentresource" sv:type="String">
<sv:value>new-properties-document.xml</sv:value>
</sv:property>
<sv:property sv:name="hippo:contentroot" sv:type="String">
<sv:value>/hippo:configuration/hippo:queries/hippo:templates</sv:value>
</sv:property>
</sv:node>

<sv:node sv:name="properties-queries-templates-new-properties-document-de">
<sv:property sv:name="jcr:primaryType" sv:type="Name">
<sv:value>hippo:initializeitem</sv:value>
</sv:property>
<sv:property sv:name="hippo:sequence" sv:type="Double">
<sv:value>20104.01</sv:value>
</sv:property>
<sv:property sv:name="hippo:contentresource" sv:type="String">
<sv:value>new-properties-document_de.xml</sv:value>
</sv:property>
<sv:property sv:name="hippo:contentroot" sv:type="String">
<sv:value>/hippo:configuration/hippo:queries/hippo:templates</sv:value>
</sv:property>
</sv:node>