[RNMobile] Tiled Gallery: Remove "link to" settings and references

[SiobhyB]

Fixes wordpress-mobile/gutenberg-mobile#4281

Gutenberg Mobile PR: wordpress-mobile/gutenberg-mobile#4304

As we're not implementing "link to" functionality in this phase of the native Tiled Gallery block (see wordpress-mobile/gutenberg-mobile#4156), this PR removes the setting from the block's bottom sheet as well as all references to it in the code.

Changes proposed in this Pull Request:

• The LinkSettingsNavigation component is removed from the Tiled Gallery's settings.
• To support the removal of the LinkSettingsNavigation component, all references to linkTo have also been removed throughout the Tiled Gallery's files.

Jetpack product discussion

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Does this pull request change what data or activity we track or use?

No, it doesn't.

Testing instructions:

• With these branches checked out and the Gutenberg Mobile demo app running, add the Tiled Gallery block.
• Select the block's settings cog/gear icon and verify that the "link to" option doesn't appear.

Before	After

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Jetpack plugin:

• Next scheduled release: December 7, 2021.
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[guarani]

Approved via wordpress-mobile/gutenberg-mobile#4304 (review).