feat: Add ability to control first month shown in date range picker

[gethinwebster]

Description

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.45%. Comparing base (6082b18) to head (426b691).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4370   +/-   ##
=======================================
  Coverage   97.45%   97.45%           
=======================================
  Files         902      902           
  Lines       26468    26482   +14     
  Branches     9539     9547    +8     
=======================================
+ Hits        25794    25809   +15     
+ Misses        668      667    -1     
  Partials        6        6           

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