Added links to Bulksearch in the header and the search bar.

[benbdeitch]

Closes #9715

This feature add some much needed linking to the new Bulk Search feature. It can now be selected from either the 'browse' menu, or the searchbar, with either option redirecting you to the page itself.

Technical

Testing

After loading up your local instance, try out both links. They should redirect you properly.

Screenshot

Stakeholders

@cdrini

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 16.74%. Comparing base (ce16a79) to head (59c6d24).
Report is 162 commits behind head on master.

Files	Patch %	Lines
openlibrary/plugins/openlibrary/js/SearchBar.js	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9716      +/-   ##
==========================================
+ Coverage   16.06%   16.74%   +0.68%     
==========================================
  Files          90       90              
  Lines        4769     4820      +51     
  Branches      832      841       +9     
==========================================
+ Hits          766      807      +41     
- Misses       3480     3489       +9     
- Partials      523      524       +1     

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