feat(themes): generate notification tokens

[abbeyhrt]

Closes #11949

This PR includes the changes to tag but those can be ignored. They will be reviewed in #12333

Generates tokens for notifications.

I wanted to get this in PR

Changelog

New

• {{new thing}}

Changed

• {{change thing}}

Removed

• {{removed thing}}

Testing / Reviewing

Verify that the components look the same! Especially for lowContrast mode since I don't think those have VRT snapshots.

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[tay1orjones]

I just pushed an update for snaps. LGTM, though as you said we should wait to merge until the tag PR has been merged in.

[tay1orjones]

Tag PR is in, this one should be good to go

[carbon-bot]

Hey there! v11.16.0 was just released that references this issue/PR.