Removes margin right from wp-block-tag-cloud

[devansh016]

What?

When you set a Tag Cloud block to the "Outline" style, the spacing between the items is set both with a gap on the container and a margin-right on reach individual link element, resulting in uneven spacing between the items.
Resolves #66678

Why?

.wp-block-tag-cloud a has margin right property causing this.

Testing Instructions

1. Insert a Tag Cloud block.
2. Set it to the "Outline" style.
3. Inspect it on the front-end, and verify that there's both a gap on the .wp-block-tag-cloud container and a margin-right on each link element, resulting in an uneven spacing between each item.

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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