Cache server: Too many open files during upload

Unity: Asset - Database

2023.1.X

2022.2.X

2021.3.X

2020.3.X

2022.1.X

Prevented growing file open count during cache server uploads

verified fixed on 2022.2.2f1

we don't support 2022.1 any more, so can't land this fix there

Verified fixed on 2021.3.16f1

Verified fixed on 2020.3.43f1

During cache server upload, the error "Too many open files" (error: EMFILE) is seen in Editor.log and subsequent uploads fail.