Commits on May 6, 2021

1. [Fix rubocop#9780] Support summary report for JUnitFormatter …

   Fixes rubocop#9780.
   
   This PR supports summary report for `JUnitFormatter`.
   
   It adds the following attributes to the `<testsuite>` element.
   
   - `tests` attribute ... Inspected file count.
   - `failures` attribute ... Total offense count.
   
   This is a JUnit format example:
   
   ```xml
   % rubocop -f junit --display-only-failed lib/rubocop/formatter/junit_formatter.rb
   <?xml version='1.0'?>
   <testsuites>
     <testsuite name='rubocop' tests='1' failures='2'>
       <testcase classname='lib.rubocop.formatter.junit_formatter' name='Layout/LineLength'>
         <failure type='Layout/LineLength' message='Layout/LineLength: Line is too long. [110/100]'>
           /Users/koic/src/github.com/rubocop/rubocop/lib/rubocop/formatter/junit_formatter.rb:65:101
         </failure>
       </testcase>
       <testcase classname='lib.rubocop.formatter.junit_formatter' name='Metrics/AbcSize'>
         <failure type='Metrics/AbcSize' message='Metrics/AbcSize:
   Assignment Branch Condition size for file_finished is too high. [&lt;8, 16, 2&gt; 18/17]'>
           /Users/koic/src/github.com/rubocop/rubocop/lib/rubocop/formatter/junit_formatter.rb:29:7
         </failure>
       </testcase>
     </testsuite>
   </testsuites>
   ```
   
   These mean the values of `1 file inspected` and `2 offenses detected` below.
   
   ```console
   % rubocop lib/rubocop/formatter/junit_formatter.rb
   Inspecting 1 file
   (snip)
   
   1 file inspected, 2 offenses detected, 2 offenses auto-correctable
   ```

   

   koic committed May 6, 2021
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