Fix #11309 (handle quotes in magics arguments)

[hongshaoyang]

fixes #11309 - handles quotes in filename param

[mUtterberg]

@hongshaoyang have you had a chance to look into the CI check failures you're getting?

[hongshaoyang]

hi @mUtterberg , yes i have. changed my approach to use regex. CI checks work now.

[minrk]

Awesome! Do you think you could write a test for this issue in core/tests/test_completion?

[hongshaoyang]

done! i've written a test in core/tests/test_magic instead because thats where all the %%writefile tests are. also modified test_magic.py to use %%writefile instead of %%file in PR #11387

[Carreau]

Thanks, that looks good to me as well.

Merging.