Keepers b9b58e8c30
threadsafe maps in restore caches (#3941)
replaces the restore cache maps with threadsafe maps.

Onedrive restores would rarely fail due to concurrent
map writes against the restore cache maps.  This change
should protect against failure in those conditions.

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#### Does this PR need a docs update or release note?

- [x]  No

#### Type of change

- [x] 🐛 Bugfix

#### Test Plan

- [x]  Unit test
- [x] 💚 E2E
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