Remove services to be undeployed from XML files

In all these cases, the intention is to undeploy all services.
Correspondingly, remove the services from the XML to avoid any
ambiguity.

ci-scripts/xml_files/container_5g_rfsim_u0_25prb.xml

@@ -144,7 +144,6 @@
                 <always_exec>true</always_exec>
                 <desc>Undeploy all OAI 5G stack</desc>
                 <node>localhost</node>
-                <services>oai-vnf oai-pnf</services>
                 <yaml_path>ci-scripts/yaml_files/5g_rfsimulator_u0_25prb</yaml_path>
                 <d_retx_th>1,0,0,0</d_retx_th>
                 <u_retx_th>1,0,0,0</u_retx_th>

ci-scripts/xml_files/container_sa_n310_2X2_100MHz_quectel.xml

@@ -146,7 +146,6 @@
     <desc>Undeploy gNB</desc>
     <node>matix</node>
     <yaml_path>ci-scripts/yaml_files/5g_sa_n310_2x2_100MHz</yaml_path>
-    <services>oai-gnb</services>
     <d_retx_th>10,100,100,100</d_retx_th>
     <u_retx_th>10,100,100,100</u_retx_th>
   </testCase>

ci-scripts/xml_files/container_sa_n310_2X2_60MHz_quectel.xml

@@ -146,7 +146,6 @@
     <desc>Undeploy gNB</desc>
     <node>matix</node>
     <yaml_path>ci-scripts/yaml_files/5g_sa_n310_2x2_60MHz</yaml_path>
-    <services>oai-gnb</services>
     <d_retx_th>15,100,100,100</d_retx_th>
     <u_retx_th>20,100,100,100</u_retx_th>
   </testCase>

ci-scripts/xml_files/container_sa_n310_4X4_60MHz_quectel.xml

@@ -146,7 +146,6 @@
     <desc>Undeploy VNF-PNF</desc>
     <node>matix</node>
     <yaml_path>ci-scripts/yaml_files/5g_sa_n310_4x4_60MHz</yaml_path>
-    <services>oai-vnf oai-pnf</services>
     <d_retx_th>10,100,100,100</d_retx_th>
     <u_retx_th>10,100,100,100</u_retx_th>
   </testCase>