Enhanced the guidance for HTTP response code

[apiarya]

This pull request updates the Microsoft Graph API guidelines to provide clearer guidance on HTTP response codes and error handling. The changes include a detailed table of recommended HTTP response codes, a new section on choosing between 400 and 422 status codes, and the removal of outdated error rules.

Enhancements to HTTP response code guidelines:

• Added a comprehensive table of HTTP response codes with descriptions, handling locations, and links to further documentation. This includes codes like 200 OK, 201 Created, 400 Bad Request, 422 Unprocessable Content, and more.
• Introduced a new section to clarify the distinction between 400 Bad Request and 422 Unprocessable Content, providing examples and validation scenarios for each.

Ref: https://learn.microsoft.com/en-us/graph/errors

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[TarkanSevilmis]

Missing 409.

[TarkanSevilmis]

Need clarification on what does requesting a resource means specifically. Examples when foo with id 123 doesn't exist, which ones return 404, they are all "requesting" a resource in the general sense?
GET /foo/123

GET /foo/?$filter=id eq 123

POST /createBarForFoo
{'fooId' = 123}

GET /bar/?$filter=fooId eq 123

[TarkanSevilmis]

Can we add this should not be intentionally returned for an understood error case? How do people feel about that?

[TarkanSevilmis]

What about:
/foo/$filter= 'name' eq 'x'
when the service doesn't support name filtering (or insert any other non-preference based request that is valid in the protocol)
Is that also 422, or something else?