resolves #5770

This lets us:

* Download images from hosts that block generic user agents (notably,
Wikimedia sites).

* Easily distinguish queries to `app.cvat.ai` made by CVAT SDK (for
analytics).

Also as a consequence of the implementation, CVAT can now reuse the
connection when downloading multiple images from the same host.

I can't really think of any benefits from using the custom user agent
for types of requests that I didn't mention (i.e. hooks, OPA, nuclio),
but for consistency I updated them all.

Fixed #5600,  #5257
Co-authored-by: NRoman Donchenko <roman@cvat.ai>

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Just simple UX improvement that allows to hide notifications on
login/logout. For example if we entered wrong credentials, and then
logined successfully, notification is still on the screen.

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Default user does'nt have access to Analytics page, so there is no
reason to show Analytics link in the header

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### Motivation and context
Resolved #5581 
<img width="917" alt="image"
src="https://user-images.githubusercontent.com/40690378/221108673-5f1b78fd-1f92-440f-a27f-bd46806fdc74.png">


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- Added test to remove project data (#5632)

- Fixed re-deleting of skeleton sublabels (attempt to remove already
removed sublabels)

![Screenshot from 2023-02-13
10-00-03](https://user-images.githubusercontent.com/49231913/218693868-0afcde6a-935a-4d3f-bfa4-c1793a367f90.png)

- Updated Label model (added `project` to `unique_together`)
- Added migration to remove or rename wrong labels

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It seems after merging #5575 we need to get models in a new way. If we
are sending default request(without page params, only first page is
returned). This pr users fetchAll function to fetch models. Also fixes
bug with incorrect 0 in result.count if there is only one page. Model
page pagination should work fine when all models would be correctly
fetched

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[cvat-data](https://github.com/opencv/cvat/tree/develop/cvat-data#versioning)
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Resolved #5727

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### Motivation and context
Resolved #5633
Also fixed storage selection when uploading a dataset

<img width="268" alt="image"
src="https://user-images.githubusercontent.com/40690378/220912019-b0596c2d-94f4-4b8f-a26f-18b0cfb6efa4.png">



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[cvat-data](https://github.com/opencv/cvat/tree/develop/cvat-data#versioning)
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Often, there are typos in the code and documentation. This PR tries to
prevent them in future by adding a recommendation to install a VS code
extension.