These changes introduce a new command to the Diagnostics panel,
`diagnostics: deploy current file`, which allows the user to view the
diagnostics only for the currently opened file.

Here's a screen recording showing these changes in action 🔽 

[diagnostics: deploy current
file](https://github.com/user-attachments/assets/b0e87eea-3b3a-4888-95f8-9e21aff8ea97)

Closes #4739 

Release Notes:

- Added new `diagnostics: deploy current file` command to view
diagnostics for the currently open file

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>