allow switching user displayed in calendar

[kevinpapst]

Description

Only activated if user has permission view_other_timesheet.

Being able to manipulate other users timesheets requires permissions:

• delete_other_timesheet
• create_other_timesheet
• edit_other_timesheet

Fixes #1746
Fixes #1067

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I verified that my code applies to the guidelines (composer code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai and will be published under the MIT license

[codecov]

Codecov Report

Merging #3314 (4391df5) into master (9138397) will decrease coverage by 0.00%.
The diff coverage is 91.30%.

@@             Coverage Diff              @@
##             master    #3314      +/-   ##
============================================
- Coverage     91.99%   91.99%   -0.01%     
- Complexity     7742     7746       +4     
============================================
  Files           739      741       +2     
  Lines         23374    23385      +11     
============================================
+ Hits          21503    21512       +9     
- Misses         1871     1873       +2     

Impacted Files	Coverage Δ
...tor/Constraints/TimesheetZeroDurationValidator.php	95.00% <83.33%> (-5.00%)	⬇️
src/Controller/CalendarController.php	84.84% <84.21%> (-5.16%)	⬇️
src/Controller/TimesheetAbstractController.php	86.21% <100.00%> (+0.41%)	⬆️
src/Controller/TimesheetController.php	100.00% <100.00%> (ø)
src/Controller/TimesheetTeamController.php	97.84% <100.00%> (ø)
src/Form/CalendarForm.php	100.00% <100.00%> (ø)
src/Form/TimesheetPreCreateForm.php	100.00% <100.00%> (ø)
src/Repository/TagRepository.php	85.52% <0.00%> (-2.64%)	⬇️