When the user's mailbox is full, we cannot make use of delta apis. This adds initial changes needed to create separate delta and non delta pagers for all of exchange.
*I would suggest looking commit wise when reviewing the PR.*
---
#### Does this PR need a docs update or release note?
- [x] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [ ] ⛔ No
#### Type of change
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- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Issue(s)
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#### Test Plan
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- [ ] 💚 E2E
<!-- PR description-->
The concurrency limiter middleware is enabled by default for exchange backups. Adding a hidden --disable-concurrency-limiter flag to disable this middleware.
Reasons for adding this flag:
We have done limited perf testing with the concurrency limiter. In addition, our understanding of exchange concurrency limits is also a bit fuzzy. This flag acts as a killswitch in case we start to see perf regressions in prod.
I see this as a temporary flag. Ideally we would never have to use it. Also, once we have a better way to configure concurrency limiter, we can eliminate this flag.
---
#### Does this PR need a docs update or release note?
- [ ] ⛔ No
#### Type of change
<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
#### Issue(s)
<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* #<issue>
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It seems to have been accidentally removed in e4be050.
---
#### Does this PR need a docs update or release note?
- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No
#### Type of change
<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Issue(s)
<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* #<issue>
#### Test Plan
<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
Cleans up and adds unit tests for options flags.
Removes variadic func builder pattern for single
func versions.
---
#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
* #2024
#### Test Plan
- [x] ⚡ Unit test
