Abhishek Pandey fb6398ea41
Remove tight CLI coupling with S3 storage provider (#4237)
<!-- PR description-->

One of the 2 remaining setup PRs before we can introduce local storage repos.

**Changes:**
1. Read storage provider(`provider`) from config file except for `repo init * ` or `repo connect *` commands.
2. Apply flag overrides based on provider type( e.g. `S3FlagOverrides` if provider is `S3`)
3. Propagate storage provider type to functions which read/write config. These functions arbitrate on config hierarchy - flags, env, config file, in that order. 

**Reasons**
* Reason 1 is needed is because config file is the source of truth for storage provider for all commands except `repo init` or `repo connect`. In the exception cases, we pick the provider in command (e.g. `s3`) as the source of truth. e.g. consider a `repo init s3`, followed by `repo init filesystem`.During `repo init filesystem`, config file would indicate `S3` provider, but the correct behavior here is to select `filesystem` provider.
* One alternative was to push provider from the init/connect cmds into an override flag, and let the config code decide on hierarchy. However, this felt hacky. provider here is not a flag to begin with. It's part of init/connect commands.


---

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

- [ ]  Yes, it's included
- [x] 🕐 Yes, but in a later PR
- [ ]  No

#### Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [x] 🧹 Tech Debt/Cleanup

#### Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* https://github.com/alcionai/corso/issues/1416

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual
- [ ]  Unit test
- [ ] 💚 E2E
2023-09-18 13:01:00 +00:00
2023-08-31 17:26:19 +00:00
2023-02-18 15:35:59 +00:00
2022-12-20 19:58:11 +00:00

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Corso

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Corso is the first open-source tool that aims to assist IT admins with the critical task of protecting their Microsoft 365 data. It provides a reliable, secure, and efficient data protection engine. Admins decide where to store the backup data and have the flexibility to perform backups of their desired service through an intuitive interface. As Corso evolves, it can become a great building block for more complex data protection workflows.

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