restoring to "--destination /foo" errors, since
drive folders aren't allowed to contain leading
slashes in their name. This PR oversteps the
correction a little to remove the leading slash
prefix from all destination declarations.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🐛 Bugfix
#### Issue(s)
* #3562
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
