Refactors the sharepoint site lookup to use the
id-to-name maps. This has a momentary regression
that will get solved in the next PR: we no longer
match on weburl suffixes, and instead require
a complete match.
Also, migrates the sharepoint lookup code out
of GC and into Discovery.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🌻 Feature
#### Issue(s)
* #2825
* #1995
* #1547
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
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