[2.x] Normalize navigation HTML ID naming

[caendesilva]

This breaking PR renames some HTML identifiers that are using camelCase instead of kebab-case.

Upgrade path:

If you have used any of the following selectors in custom code you wrote yourself, you will need to update to use the new changed IDs.

• Rename HTML ID #searchMenu to #search-menu
• Rename HTML ID #searchMenuButton to #search-menu-button
• Rename HTML ID #searchMenuButtonMobile to #search-menu-button-mobile

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.87%. Comparing base (81d73b3) to head (5a71241).

❗ Current head 5a71241 differs from pull request most recent head be0f780. Consider uploading reports for the commit be0f780 to get more accurate results

Additional details and impacted files

@@                       Coverage Diff                        @@
##             improved-navigation-internals    #1622   +/-   ##
================================================================
  Coverage                            99.87%   99.87%           
  Complexity                            1778     1778           
================================================================
  Files                                  184      184           
  Lines                                 4809     4809           
================================================================
  Hits                                  4803     4803           
  Misses                                   6        6           

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