refactor(date-utils) ♻️ Rename misleading getDayOfWeekCode to getDayOfMonthCode

[balajis-qb]

Description

Linked issue: #6217

Problem
This PR renames a date utility function and update its documentation to correctly reflect it's day-of-month behaviour when using the ddd format. The previous name getDayOfWeekCode implies it would return week codes like 'sun', 'mon', etc. However, it actually returns the day of the month as a zero-padded 3-digit string (e.g. "001", "002", "003", etc).

Changes

• Renamed getDayOfWeekCode to getDayOfMonthCode
• Removed the unused locale argument
• Updated the documentation to correctly reflect the new function's behaviour
• Updated the code to use the new function
• Updated the tests to reflect the new function's behaviour
• No functional changes

Contribution checklist

• I have followed the contributing guidelines.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.29%. Comparing base (548a1f3) to head (56574ba).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6218   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files          30       30           
  Lines        3822     3822           
  Branches     1648     1665   +17     
=======================================
  Hits         3795     3795           
  Misses         26       26           
  Partials        1        1           

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