Ensure project path is trimmed upon project creation

What does this MR do and why?

Ensure project path is trimmed upon project creation

This updates some code that attempted to interact with a DOM element through jQuery's API.

Changelog: fixed

This was likely overlooked in !88012 (merged).

Screenshots or screen recordings

Before	After
	No error.

How to set up and validate locally

1. Open the New project form at http://gdk.test:3000/projects/new#blank_project.
2. In the path input, add some value with trailing and or leading blank spaces.
3. Submit the form.
   • No error should appear, and the path input's value should be updated to remove extraneous spaces.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.