Add a second Nav_Walker for Secondary Menu

[Soare-Robert-Daniel]

Summary

The Secondary Menu was using only the default WordPress Nav Walker. Because of this, some missing elements prevented the Mobile Sidebar from working.

Since only the primary menu could enqueue those resources, the secondary menu did not work correctly in his absence.

To fix this, I added a new class that inherits all the functionality of the Nav_Walker but enqueues only the needed resources.

Will affect visual aspect of the product

NO

Screenshots

Test instructions

• Follow the instructions from the issue description
• The mobile sidebar should work only when the secondary menu is present.

Check before Pull Request is ready:

• [x] I have written a test and included it in this PR
• [x] I have run all tests and they pass
• [x] The code passes when running the PHP CodeSniffer
• [x] Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• [x] Security and Sanitization requirements have been followed
• [x] I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/neve-pro-addon/issues/2802

[pirate-bot]

Plugin build for 423260514e4fe010646e9b0a7e9360c368a915db is ready :bellhop_bell:!

• Download build

[irinelenache]

@Soare-Robert-Daniel Tested and the issue is fixed now ✅

[pirate-bot]

:tada: This PR is included in version 3.8.8 :tada:

The release is available on GitHub release

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