closes #1621

Test Plan:

• On any feed, if you long press an image that is a preview for a shared URL, you should be able to see a flash message saying that the link was copied.
• If you you to create a new post and paste on the text imput, you should be able to see the link that you copied

changed the description

added 16 commits

• 1408b28d...83e16200 - 15 commits from branch release/3.16.0
• eec9371d - Merge remote-tracking branch 'origin/release/3.16.0' into copy-link-on-image-longpress

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