feat(python)!: Expedited removal of certain deprecated functionality (2)

[stinodego]

Ref #13525

Changes

• Remove deprecated check_sorted parameter from ewm_by and rolling. This was only deprecated recently, but I'd rather not leave this useless parameter laying around. We made the same update for the other rolling functions.
• Remove deprecated utc parameter from str.to_datetime.
• Remove deprecated ambiguous parameter in dt.round.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.32%. Comparing base (4d35be2) to head (9f1ccf0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16779      +/-   ##
==========================================
+ Coverage   81.29%   81.32%   +0.02%     
==========================================
  Files        1424     1424              
  Lines      187205   187198       -7     
  Branches     2714     2711       -3     
==========================================
+ Hits       152194   152231      +37     
+ Misses      34514    34470      -44     
  Partials      497      497              

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