chore: 🤖 Migrate xterm to @xterm

[calcaide]

Description

Migrate xterm to @xterm and addons.

Successful boundary-ui-release run after upgrade

Jira ticket

How to Test

• Run the desktop client build process locally.
• Run the boundary-ui-releases successfully.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
boundary-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 20, 2024 3:44pm
boundary-ui-desktop	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 20, 2024 3:44pm