Move sdformat14 as stable in sdformat.dsl

[j-rivero]

This should help with missing jobs. It will bring some undesired focal builds that should be removed under the scope of #1010.

[j-rivero]

diff -ur -I '.*<id>dashboard_portlet_.*</id>.*' /tmp/current_xml_configuration/sdformat-abichecker-any_to_any-ubuntu_auto-amd64.xml /tmp/pr_xml_configuration/sdformat-abichecker-any_to_any-ubuntu_auto-amd64.xml
--- /tmp/current_xml_configuration/sdformat-abichecker-any_to_any-ubuntu_auto-amd64.xml	2023-09-11 15:43:57.809031785 +0000
+++ /tmp/pr_xml_configuration/sdformat-abichecker-any_to_any-ubuntu_auto-amd64.xml	2023-09-11 15:42:07.639729242 +0000
@@ -84,6 +84,9 @@
                 <org.jenkinsci.plugins.ghprb.GhprbBranch>
                     <branch>sdf13</branch>
                 </org.jenkinsci.plugins.ghprb.GhprbBranch>
+                <org.jenkinsci.plugins.ghprb.GhprbBranch>
+                    <branch>sdf14</branch>
+                </org.jenkinsci.plugins.ghprb.GhprbBranch>
             </whiteListTargetBranches>
             <triggerPhrase>.*(re)?run test(s).*</triggerPhrase>
             <extensions>
Only in /tmp/pr_xml_configuration: sdformat-ci-sdformat14-focal-amd64.xml
Only in /tmp/pr_xml_configuration: sdformat-ci-sdformat14-homebrew-amd64.xml
Only in /tmp/pr_xml_configuration: sdformat-ci_asan-sdformat14-focal-amd64.xml
Only in /tmp/pr_xml_configuration: sdformat-install-sdformat14_pkg-focal-amd64.xml
Only in /tmp/pr_xml_configuration: sdformat-sdf-14-win.xml
Only in /tmp/pr_xml_configuration: sdformat14-install_bottle-homebrew-amd64.xml

All the linux jobs generated here are not really useful, as said we can change them in a different PR under the works of #1010.