[11.9] Remove Trailing slash on project path

[ajuchacko]

Fix: #739

✅ Added Testcase
✅ All tests are passing on local

[danepowell]

Tested and confirmed this fixes #739 (and by extension, https://github.com/acquia/cli/issues/1377). Thanks!

[GrahamCampbell]

Thanks for starting work on this. I feel the root cause is that the project method is not meant to be called with an empty string. I've fixed this, accordingly.

[ajuchacko]

Thanks for starting work on this. I feel the root cause is that the project method is not meant to be called with an empty string. I've fixed this, accordingly.

You're right, It makes sense 👍