Fix settings_block animations glitches

What does this MR do and why?

This MR fixes two glitches in the settings_block component:

• The component does not animate to close on page load anymore
• The component does not have a weird flickering during the animation when more than one are present

Screenshots or screen recordings

Before

Screen_Recording_2021-10-11_at_04.07.29_PM

Screen_Recording_2021-05-24_at_1.36.32_PM__1_

After

SettingsAnimationFix |

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Go to a setting page using this component, IE: packages & registries
2. Or test it in the storybook

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #331774 (closed) Related to #342801 (closed)