feat: make notification channel headings clickable in notification

[ayesha-waris]

INF-1062

Explanation:

The code for the notification channel headings has been made more generic. An on-click event handler has been implemented along with relevant updates in the selectors, thunk, and service files needed for it.

The implementation for the new back-end API can be found in PR

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (0ee0f41) 56.50% compared to head (6573b59) 56.53%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
src/notification-preferences/data/thunks.js	28.57%	5 Missing ⚠️
src/notification-preferences/data/service.js	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
+ Coverage   56.50%   56.53%   +0.02%     
==========================================
  Files         118      118              
  Lines        2435     2457      +22     
  Branches      652      654       +2     
==========================================
+ Hits         1376     1389      +13     
- Misses        988      997       +9     
  Partials       71       71              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[awais-ansari]

Please add a test case for this change other than this PR LGTM.