[Admin/StreetCode] [Video POST/PUT] There is no video URL validation; the admin can add not only a YouTube link

[SophiaMRI]

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Environment: All Reproducible: Always Build found: a7d807f

Preconditions

1. Postman is open.
2. The right method is chosen.
3. Valid endpoints have been written.
4. All required data has been added to the body.

Issue	Steps to reproduce	Actual result	Expected result
[POST] [Empty array]	1. Add an empty array to the video "url" key ( [ ] ). 2. Send the request.	The 200 status returned in the response. The 'Unexpected Application Error!' message is on the front.	The '400 Bad Request' status, with the message 'The "url" video field is invalid,' is returned in the response.
[POST] [Empty key]	1. Leave the video "url" key empty (" "). 2. Send the request.	The 200 status returned in the response. The black disabled block in the video place is present on the front.	The '400 Bad Request' status, with the message 'The "url" video field is invalid,' is returned in the response.
[POST/PUT] [Non-YouTube link]	1. Add a non-YouTube link in the URL key (e.g. "https:/ /www.wikipedia.com.ua"). 2. Send the request.	The 200 status returned in the response. The black disabled block in the video place is present on the front.	The '400 Bad Request' status, with the message 'The "url" video field is invalid,' is returned in the response.
[POST] [Numbers]	1. Add numbers in the video "url" key (e.g. "1234"). 2. Send the request.	The 200 status returned in the response. The black disabled block in the video place is present on the front.	The '400 Bad Request' status, with the message 'The "url" video field is invalid,' is returned in the response.
[POST/PUT] [Numbers&special characters]	1. Add numbers and special characters in the video "url" key (e.g. "12-34*%"). 2. Send the request.	The 200 status returned in the response. The black disabled block in the video place is present on the front.	The '400 Bad Request' status, with the message 'The "url" video field is invalid,' is returned in the response.
[POST/PUT] [Letters]**	1. Add all required data in the body. 2. Add a some word in the URL key (e.g. "string"). 2. Send the request.	The 200 status returned in the response. The black disabled block in the video place is present on the front.	The '400 Bad Request' status, with the message 'The "url" video field is invalid,' is returned in the response.

User story and test case links User story #122 [Test case] #352