SCIX-776 fix: hide notification bell functionality for unauthenticated users

[thostetler]

The notification bell on the search results page was accessible to unauthenticated users, allowing them to attempt creating email notifications without being logged in.

• Added authentication check for the bell button in ListActions
• Unauthenticated users now see a gray bell icon with a popover explaining login is required
• Popover includes links to login and create account pages
• Extracted NotificationBellButton component for cleaner code organization
• Added tests for both authenticated and unauthenticated bell button behavior

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.8%. Comparing base (9678f94) to head (56f1fe1).
⚠️ Report is 12 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (9678f94) and HEAD (56f1fe1). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (9678f94)	HEAD (56f1fe1)
unittests	2	1

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #762      +/-   ##
=========================================
- Coverage    71.8%   60.8%   -11.0%     
=========================================
  Files         217     300      +83     
  Lines       24485   34871   +10386     
  Branches     1402    1486      +84     
=========================================
+ Hits        17575   21192    +3617     
- Misses       6878   13645    +6767     
- Partials       32      34       +2     

Files with missing lines	Coverage Δ
src/components/ResultList/ListActions.tsx	78.0% <100.0%> (ø)

... and 102 files with indirect coverage changes

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[shinyichen]

Looks good. I updated the tour related id, because the id of IconButton was getting overwritten by chakra in the popover.