[Issue] Backend: focus search field when pressing forwardslash - '/'

[m2-assistant]

keydown event listener in magento backend to activate global search form if forward slash was pressed.

Preconditions (*)

1. Magento 2.4

Steps to reproduce (*)

1. Login to backend
2. Press '/' on the keyboard.
3. Start typing a query.

Expected result (*)

No need to grab the mouse!

Actual result (*)

Not working with forward slash

https://user-images.githubusercontent.com/306080/78894531-e03bd000-7a75-11ea-9f27-5378aca18200.gif

[m2-assistant]

Hi @krishprakash. Thank you for working on this issue.
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