prefer-global-this should also reject self in service workers

[fregante]

Worker APIs should use self

I think self was chosen because there's no window, but globalThis should still be preferred there I think.

• Service workers introduction: 2014
• globalThis introduction: 2019

I think using self in service workers is more of a historical artifact rather than a necessity.

Originally posted by @fregante in #2410 (comment)

[sindresorhus]

I think self was chosen because there's no window, but globalThis should still be preferred there I think.

Agreed 👍

[zanminkian]

self and global are not standard in browser and node. So I still believe we don't need self and global completely, including computed members like global[foo]. Computed members like global[foo] and self[foo] can be replaced with globalThis[foo].