sysupdate: display all component documentation URLs in table output

Component definitions may contain multiple Documentation= URLs, but the
components command previously displayed only the first URL in text output.

Use TABLE_STRV_WRAPPED to display all component documentation URLs in the
table, making the full documentation list visible to users.
Add integration test coverage for multiple Documentation= assignments.

test/units/TEST-72-SYSUPDATE.sh

@@ -699,6 +699,11 @@ done
 # that a ‘default’ component is only listed by sysupdate if it’s fully configured
 mv "$CONFIGDIR" "$CONFIGDIR.backup"
 mkdir -p /run/sysupdate.some-component.d
+cat >/run/sysupdate.some-component.component <<EOF
+[Component]
+Documentation=https://example.com/some-component
+Documentation=https://example.com/some-component-more
+EOF
 tee /run/sysupdate.some-component.d/portable.transfer << EOF
 [Transfer]
 ChangeLog=https://example.com/changelog/@v
@@ -716,6 +721,9 @@ MatchPattern=some-component_@v
 CurrentSymlink=some-component
 EOF
 "$SYSUPDATE" --json=short components | grep -F '{"default":false,"components":["some-component"]}' >/dev/null
+component_output="$("$SYSUPDATE" components)"
+grep -F "https://example.com/some-component" <<<"$component_output" >/dev/null
+grep -F "https://example.com/some-component-more" <<<"$component_output" >/dev/null
 varlinkctl call "$VARLINK_SOCKET" io.systemd.SysUpdate.ListTargets | jq -e '.targets | all(.id.class != "host")' >/dev/null
 mkdir /run/sysupdate.d
 "$SYSUPDATE" --json=short components | grep -F '{"default":false,"components":["some-component"]}' >/dev/null
@@ -734,6 +742,7 @@ varlinkctl call "$VARLINK_SOCKET" io.systemd.SysUpdate.ListTargets | jq -e '.tar
 # Clean up regression test
 rmdir /run/sysupdate.d
 rm -rf /run/sysupdate.some-component.d
+rm -f /run/sysupdate.some-component.component
 mv "$CONFIGDIR.backup" "$CONFIGDIR"
 
 # Make sure the processing of compressed streams still handles uncompressed streams shorter than