DateRangePicker: Fix tests - update selected range to use future dates

[Anu6is]

Description

By default the initial calendar shows the current month and next month. The existing tests use a range of 7 days in the past to the present day. This resulted in the possibility of the start date being in the previous month when the current day is within the first week of the current month. This causes tests to fail since mud-range-start-selected isn't visible (previous month isn't visible, only current and next)

How Has This Been Tested?

Visually with the test view and with the unit tests

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've updated relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.39%. Comparing base (8acb6c5) to head (3643016).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #8543   +/-   ##
=======================================
  Coverage   89.38%   89.39%           
=======================================
  Files         413      413           
  Lines       11865    11865           
  Branches     2354     2354           
=======================================
+ Hits        10606    10607    +1     
+ Misses        737      736    -1     
  Partials      522      522           

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