Multi-selection: Link sharing

[0nko]

Task/Issue URL: https://app.asana.com/0/72649045549333/1209118961868651

Description

This PR adds the tab sharing for selected tabs in the tab switcher.

Steps to test this PR

Single tab

• Go to tab switcher
• Tap on the More menu button
• Tap on the Share link
• Verify a link-sharing bottom sheet appears with the active tab URL & title
• Tap on the More menu button
• Tap on Select tabs to trigger selection mode
• Select a single tab
• Tap on the Share toolbar button
• Verify a link-sharing bottom sheet appears with the selected tab URL & title
• Dismiss the bottom sheet
• Tap on the More menu button
• Tap on the Share link
• Verify a link-sharing bottom sheet appears with the selected tab URL & title

Multiple tabs

• Go to tab switcher
• Tap on the More menu button
• Tap on Select tabs to trigger selection mode
• Select more than 1 tab
• Tap on the Share toolbar button
• Verify a text-sharing bottom sheet appears with a numbered list of selected tabs' URLs

[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

• Multi-selection: Bookmarking #5716
• Multi-selection: Link sharing #5710 👈 (View in Graphite)
• Multi-selection: Selection mode #5623
• Multi-selection: Dynamic menu #5588
• Multi-selection: Add new FAB to the tab switcher #5467
• Multi-selection: Add a new feature flag for multi-selection #5464
• develop

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