fix project update failure if project doesn't exist and not logged in as root

[AnuragThePathak]

Signed-off-by: Anurag Pathak anuragpathak911@gmail.com Fixes #1947

What this PR does / why we need it: It solves the issue of brig update receiving authorization error when project doesn't exist and not logged in as root.

Special notes for your reviewer: I've removed checking of project not found error in the project update function after the update attempt using Project Store because I feel it is no longer relevant now as we already did that earlier part of that function. I have also modified the unit test just that all test cases pass. However they may be rearranged now to match the change in the update function (I can do that as well if required). Moreover when -c flag is used we create a project which is requested to be updated but in logs we inform the project to be updated instead of informing it to be created. Not really sure if that's how it's supposed to work.

If applicable:

• [ ] this PR contains documentation
• [x] this PR contains unit tests
• [ ] this PR has been tested for backwards compatibility

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[krancour]

@AnuragThePathak this looks great!

I am noticing one issue -- but it's not new -- not introduced by your change. That is that we aren't verifying the user has permission to create projects before proceeding with project creation.

Especially given that this PR does not introduce that problem, let's treat it as a separate problem. I'll open a new issue and if you don't mind, I'll assign it to you.

/brig run