Config Refactor Round 2.

[nharper285]

Summary of the Pull Request

What is this about?
Currently, a number of parameters and arguments must be specified when a user configures their endpoint to an instance.
ex.
onefuzz config --endpoint https://[endpoint].azurewebsites.net/ --authority https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47 --client_id 72f1562a-8c0c-41ea-beb9-fa2b71c80134

These parameters - authority, client_id, tenant_domain, etc. - are used to authenticate to the instance when a user runs a CLI command. They are stored on the local machine, as well.

Proposal
Refactor the CLI config command such that it does not require these parameters and only asks the user to specify the endpoint. Instead, store the additional config params on the instance - to be set at deployment time - and pull them down every time a user makes a request.

PR Checklist

• Applies to work item: CLI Config Refactor #2773, Create new public Config function for retrieving endpoint params.  #2774, Update CLI to use Config function for auth and get rid of old endpoint config params  #2775

Validation Steps Performed

How does someone test & validate?

• Single-tenant deployment w/ ms tenant
• Single-tenant deployment w/ secure tenant
• Multi-tenant deployment
• Run command against ms tenant instance
• Run command against secure tenant instance
• Run command against multi-tenant instance
• Run command w/ service prinicpal
• Deploy upgrade using existing service principal

[codecov-commenter]

Codecov Report

Merging #2771 (e5d1e2c) into main (3d2fb65) will decrease coverage by 0.02%.
The diff coverage is 3.84%.

@@            Coverage Diff             @@
##             main    #2771      +/-   ##
==========================================
- Coverage   29.16%   29.14%   -0.02%     
==========================================
  Files         321      322       +1     
  Lines       38583    38607      +24     
==========================================
  Hits        11252    11252              
- Misses      27331    27355      +24     

Impacted Files	Coverage Δ
src/ApiService/ApiService/Functions/Config.cs	0.00% <0.00%> (ø)
...rc/ApiService/ApiService/OneFuzzTypes/Responses.cs	72.29% <0.00%> (-2.01%)	⬇️
src/ApiService/ApiService/ServiceConfiguration.cs	0.00% <0.00%> (ø)
src/ApiService/ApiService/UserCredentials.cs	32.35% <0.00%> (ø)
...iService/ApiService/onefuzzlib/ConfigOperations.cs	32.35% <100.00%> (ø)

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