Availability endpoint gives RequestId and Edit boolean

[christiangryt]

Description

Availability endpoint passes RequestId and CanEdit fields along with old ones. For every unavailable range the corresponding LendingRequestId is passed as well as a permission check for the user making the request if they are allowed to make changes to said request.

Allows lending calender to link unavailable times (approved requests) to the actual request if the user has the permission to do so.

Changed Lending API test to accept answer length 6 to accommodate 2 extra fields being passed.

Testing

• The code quality is at a minimum required level of quality, readability, and performance.
• I have thoroughly tested my changes.

Ran all lego tests along with code style fixes.

Resolves webkom x bekk

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.65%. Comparing base (022a639) to head (560fac0).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4120   +/-   ##
=======================================
  Coverage   82.64%   82.65%           
=======================================
  Files         359      359           
  Lines       12703    12705    +2     
=======================================
+ Hits        10499    10501    +2     
  Misses       2204     2204           

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