Enhance e2e (end-to-end) tests for search page

[tdonohue]

Describe the bug

Enhance the existing e2e tests in search.cy.ts to include testing of additional search page features (e.g. https://demo.dspace.org/search). These features may include:

• Verify filters work as expected. Add tests for different types of filters (e.g. date, author, subject). Ensure the search box under each filter works properly.
• Verify filters can be removed one-by-one after added
• Verify "Reset filters" button works
• Verify results per page & sort options work in the "Settings" section of sidebar.
• Verify pagination works properly
• Verify "Show more" under one result can be expanded / contracted.
• Verify thumbnails display
• Verify title and thumbnail can be clicked to go to the Item / Entity page
• On grid layout, verify "Show More" expands the card
• On grid layout, verify "View" button brings you to the Item / Entity page

Expected behavior

The Search page actions should be more fully tested

Related work

Subticket of #3978