v3.1.1 Release Plan

[JillieBeanSim]

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1. Error when starting Zowe Explorer and creating the default team config file #3425
   bug priority-high severity-high +3
   
2. TypeError when adding profile to tree #3415
   bug priority-medium severity-medium +3
   
3. ZoweExplorerZosmfApi.getSession returning undefined in cases #3337
   bug priority-medium severity-low +3
4. fix(error): Check if session is valid before calling proxy setup fn #3428
   no-changelog size/M +2
   
5. USS delete quick key broken #2796
   bug priority-medium severity-low +3
   
6. fix: Pass TreeView selection when node is undefined #3417
   size/M +1