Update `Icon` and `Button` for SLDS2

[msmx-mnakagawa]

※ I'll open this PR after all the other components' PRs are merged, because Icon and Button affects the others so much.

References

• https://v1.lightningdesignsystem.com/components/icons/
• https://v1.lightningdesignsystem.com/icons/
• https://v1.lightningdesignsystem.com/components/buttons/

[reg-suit[bot]]

reg-suit detected visual differences.

Check this report, and review them.

:white_circle:

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What do the circles mean?

The number of circles represent the number of changed images.
:red_circle: : Changed items, :white_circle: : New items, :black_circle: : Deleted items, and :large_blue_circle: Passed items

How can I change the check status?

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[msmx-mnakagawa]

@stomita

If the SLDS ver in story is old, it must be synced with the lib update and adding new icon support.

I got it. I moved the commit fdc4e0d03fcc3abcfc706d04e193359cb2418d02, which updates icon types, to #484.

[msmx-mnakagawa]

@stomita Thank you for noticing that..

I removed the VRT unexpected diff in 5a141a3d.