fix(font-family): added system fonts

[sstrubberg]

Closes #8764

Updates font-families in the @carbon/type package with the following:

• Arabic
• Devanagari
• JP
• KR
• Thai

Replaced all the Helvetica Neue stuff with system-ui, -apple-system, BlinkMacSystemFont, '.SFNSText-Regular', sans-serif

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[joshblack]

@sstrubberg I think we can keep the existing font stacks the same but use the system UI ones for the new fonts that we're going to be shipping through the Plex package. I think these include:

• Arabic
• Devanagari
• JP
• KR
• Thai

What do you think? 👀

[tw15egan]

LGTM 👍 ✅