66776 [flutter_tools] remove all pub caching logic (cla: yes, tool)

66780 [flutter_tools] do not error doctor on missing vs code extension (cla: yes, tool)

66782 [flutter_tools] do not error flutter doctor on missing AS/intellij plugins (cla: yes, tool)

66783 fix the tree (cla: yes, f: cupertino, framework)

66785 Add textSelectionControls to TextField etc. (cla: yes, f: cupertino, f: material design, framework)

66787 [flutter_tools] add a mechanism to turn off immediate tool exit (cla: yes, tool)

66798 Fix ListTile assert when layout at zero size (cla: yes, f: material design, framework)

66801 Minor tool text typo (cla: yes, tool, waiting for tree to go green)