Replaced date-fns utility functions from DateInputV2 component with day.js

[thedevildude]

WHAT

🤖 Generated by Copilot at a9a3a54

Refactored date input component to use dayjs library instead of date-fns. This improves consistency and compatibility with other components that use dayjs. Modified DateInputV2.tsx and related files to use dayjs methods for date operations and display.

Proposed Changes

• Fixes Remove date-fns to reduce bundle size #6305?
• Replaced date-fns utility functions with dayjs functions in DateInputV2 component

@coronasafe/care-fe-code-reviewers @coronasafe/code-reviewers

HOW

🤖 Generated by Copilot at a9a3a54

• Replace date-fns library with dayjs library for date manipulation and formatting in DateInputV2.tsx component (link)
• Update switch cases for handling left and right arrow clicks on the date picker to use dayjs methods for subtracting and adding months, years, and decades (link, link)
• Update functions for checking selected date and getting day count and blank days array to use dayjs methods for comparing and getting dates (link, link)
• Update div and p elements for displaying month and year on the date picker header and grid to use dayjs methods for formatting dates (link, link, link)

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[github-actions]

👋 Hi, @thedevildude,
Conflicts have been detected against the base branch. Please rebase your branch against the base branch.

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This message is automatically generated by prince-chrismc/label-merge-conflicts-action so don't hesitate to report issues/improvements there.

[nihal467]

LGTM @rithviknishad @khavinshankar review it