Tab manager update: Replace FABs with buttons

[0nko]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1207418217763355/task/1210543205190057?focus=true

Description

This PR hides the FABs and replaces them with toolbar buttons (NTP, Duck.ai).

Steps to test this PR

Normal mode

• Go to the tab manager
• Verify the FABs are gone
• Verify the layout button is gone (will be added to the menu later)
• Verify the
• Verify the Duck.ai and NTP buttons are visible
• Tap on the menu button
• Verify thew Net tab and Duck.ai menu items are gone
• Check that the new toolbar buttons are functional

Selection Mode

• Go to tab manager -> Tap on the Menu button -> Tap Select Tabs
• Verify all toolbar buttons are hidden
• Tap one the Menu button
• Verify Select All option is visible
• Tap on the Select All menu item
• Verify the toolbar buttons are still hidden
• Exit the selection mode
• Verify the Duck.ai and NTP buttons are visible now

[0nko]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Tab manager update: Replace FABs with buttons #6384 👈 (View in Graphite)
• Tab manager update: Add a bottom toolbar position support #6373
• Tab manager update: Add a feature flag #6372
• Tab manager toolbar update feature #6371
• develop

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