add junit/ to gitignore and fix ci.yml

[sharonxiaohanli]

Issue #, if available: N/A

Description of changes:

1. fix ci.yml

   (env) % pip install .[dev]  
   zsh: no matches found: .[dev]

   vs

   (env) % pip install '.[dev]'
   Processing ...
   Installing build dependencies ... done
   Getting requirements to build wheel ... done
   Installing backend dependencies ... done
   Preparing metadata (pyproject.toml) ... done

2. git ignore junit/

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