Remove edit gallery toolbar button

[jorgefilipecosta]

Description

This PR follows the suggestion discussed on #16548 (comment) and removes the edit gallery button from the gallery block.

How has this been tested?

I created a gallery I added some images and I verified the edit gallery button does not appear on the block toolbar.

[youknowriad]

I personally feel it's better because the way that button worked was confusing and now we can move, remove and add images without opening the media library (inline).

We might need a button in the image itself to edit one image (The last mockup here should be a good starting point #11952)

That said, let's have more thoughts here @karmatosed @mapk @mtias @kjellr

[kjellr]

Interesting. As others noted in the previous thread, the main thing missing here is the ability to edit metadata for individual images. Maybe we should add in a control like this?

Anyway, as long as we have a plan for that, I think it's probably okay to remove this menu item.

(As an aside, I originally missed those move controls, so I opened a PR to help make them a little larger. Really though, I can't wait for drag & drop to happen for these — I imagine that'll be the primary way of rearranging galleries for many people.)

[mapk]

I'm trying to test this out, but it appears I no longer have a Gallery block. Am I gutenberging wrong?

[mapk]

Nevermind, I had the Gallery block hidden in the Block Manager. It's working as expected! Basically, I was definitely Gutenberging wrong.

[jorgefilipecosta]

It's working as expected!

Hi @mapk, is that a green light :)?

[mapk]

Yep, good to go! Thanks!