fix: update pagination button aria-label

[jgadewar-c-eightfold]

SUMMARY:

1. The announcement for the page button in the pagination component was not clear
2. Updated the announment to include the number of pages

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

https://eightfoldai.atlassian.net/browse/ENG-147174

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

1. Check for the Pagination Component
2. Each button representing pages should announce, Page 1 of 5, current button, etc for the selected page
   Page 1 of 5 , button - for unselected page

Screen.Recording.2025-08-06.at.2.03.25.PM.mov

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