fix: deprecate unused window parameter in the EnableBackup call

[phm07]

Since the API ignores the backup_window parameter anyway we do not need to send it in requests and can just ignore the variable in Go. This PR also updates the corresponding comment and the tests.

Closes #525

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.47%. Comparing base (a90d4c2) to head (d3b89ed).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
+ Coverage   71.46%   71.47%   +0.01%     
==========================================
  Files          46       46              
  Lines        3935     3930       -5     
==========================================
- Hits         2812     2809       -3     
+ Misses        710      709       -1     
+ Partials      413      412       -1     

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