some housecleaning before reviewing deadlock issues
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replace all cases of new|wrap|stack(...).WithClues(ctx) with the flattened new|wrap|stackWC(ctx, ...) functions introduced in the latest clues bump.
Other changes added:
* remove WithClues builders when the error producer already called it.
* corrected some usages of ictx within loops.
no logic changes, just cleanup.
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#### Does this PR need a docs update or release note?
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#### Type of change
- [x] 🧹 Tech Debt/Cleanup
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various tidbits of data cleanup before moving forward with adding export behavior to groups.
* move duplicate collections mocks into data/mock
* move the export collection struct into pkg/export (to prevent future duplicates in the next PR)
* rename export.Collection to Collectioner, because it's an interface.
* some other non-logic rearrangement
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
* #3991
#### Test Plan
- [x] ⚡ Unit test
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This borrows a lot of the core logic from OneDrive as the internal structure is mostly the same.
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Prev: https://github.com/alcionai/corso/pull/3822
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#### Does this PR need a docs update or release note?
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- [ ] 🕐 Yes, but in a later PR
- [ ] ⛔ No
#### Type of change
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- [x] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Issue(s)
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* fixes https://github.com/alcionai/corso/issues/3823
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- [x] ⚡ Unit test
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