Removed the redundant tooltip on hovering over a holiday

[balajis-qb]

Description

Linked issue: #6260

Problem
As I mentioned in the ticket, we're getting a redundant tooltip on hovering over a holiday. The reason is because we have added the same tooltip on the title and also added as a tooltip overlay. As a fix, I removed it from the holiday names from the title attribute.

Changes

• Previously we're displaying both holidays and excluded date messages as a title. But I removed holiday messages from title as we're already displaying it as a custom tooltip overlay
• Updated the test cases to check for holiday messages in the overlay instead of the title attribute.
• Adjusted the position of the tooltip for a better UX.
• Updated the example of the holiday dates to use dynamic year.

Screenshots

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• 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 99.31%. Comparing base (548a1f3) to head (bd7842a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6261      +/-   ##
==========================================
+ Coverage   99.29%   99.31%   +0.02%     
==========================================
  Files          30       30              
  Lines        3822     3818       -4     
  Branches     1648     1668      +20     
==========================================
- Hits         3795     3792       -3     
+ Misses         26       25       -1     
  Partials        1        1              

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