Remove text selection on sequence track with user-select: none

[cmdcolin]

Fixes #4175

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c85867b) 62.86% compared to head (bebc89d) 62.86%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
...roducts/jbrowse-web/src/tests/OAuthServer/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4190   +/-   ##
=======================================
  Coverage   62.86%   62.86%           
=======================================
  Files        1070     1070           
  Lines       31175    31175           
  Branches     7445     7445           
=======================================
  Hits        19598    19598           
  Misses      11408    11408           
  Partials      169      169           

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