Simplify Feature Configuration

[smatting]

https://wearezeta.atlassian.net/browse/SQSERVICES-658

• Remove FeatureTag type completely

Checklist

• Delete all commented-out code
• The PR Title explains the impact of the change.
• The PR description provides context as to why the change should occur and what the code contributes to that effect. This could also be a link to a JIRA ticket or a Github issue, if there is one.
• changelog.d contains the following bits of information (details):
  • A file with the changelog entry in one or more suitable sub-sections. The sub-sections are marked by directories inside changelog.d.

[smatting]

3 tests still fail

    service whitelist
      search permissions:                                                              [galley] E, IO Exception occurred, message=Error {code = Status {statusCode = 403, statusMessage = "Forbidden"}, label = "operation-denied", message = "Insufficient permissions", errorData = Nothing}, request=N/A
[brig] E, IO Exception occurred, message=responseJsonUnsafeWithMsg: WithStatus SndFactorPasswordChallengeConfig Error in $: key "status" not found CallStack (from HasCallStack):   error, called at src/Bilge/Response.hs:143:7 in bilge-0.22.0-inplace:Bilge.Response   responseJsonUnsafeWithMsg, called at src/Bilge/Response.hs:132:22 in bilge-0.22.0-inplace:Bilge.Response   responseJsonUnsafe, called at src/Brig/IO/Intra.hs:1405:3 in brig-2.0-inplace:Brig.IO.Intra, request=N/A
[brig] E, code=500, label=server-error, request=N/A, "Server Error"
FAIL
        Exception: Assertions failed:
         1: 200 =/= 500
        
        Response was:
        
        Response {responseStatus = Status {statusCode = 500, statusMessage = "Internal Server Error"}, responseVersion = HTTP/1.1, responseHeaders = [("Transfer-Encoding","chunked"),("Date","Tue, 07 Jun 2022 15:59:54 GMT"),("Server","Warp/3.3.17"),("Vary","Accept-Encoding"),("Content-Encoding","gzip"),("Content-Type","application/json")], responseBody = Just "{\"code\":500,\"label\":\"server-error\",\"message\":\"Server Error\"}", responseCookieJar = CJ {expose = []}, responseClose' = ResponseClose}
        CallStack (from HasCallStack):
          error, called at src/Bilge/Assert.hs:89:5 in bilge-0.22.0-inplace:Bilge.Assert
          <!!, called at src/Bilge/Assert.hs:107:19 in bilge-0.22.0-inplace:Bilge.Assert
          !!!, called at test/integration/API/Provider.hs:749:3 in main:API.Provider
        Use -p '/search permissions/' to rerun this test only.
      update permissions:                                                              FAIL
        Exception: Assertions failed:
         1: 403 =/= 500
         2: Just "insufficient-permissions" =/= Just "server-error"
        
        Response was:

      search:                                                                          [galley] E, IO Exception occurred, message=Error {code = Status {statusCode = 403, statusMessage = "Forbidden"}, label = "operation-denied", message = "Insufficient permissions", errorData = Nothing}, request=N/A
[brig] E, IO Exception occurred, message=responseJsonUnsafeWithMsg: WithStatus SndFactorPasswordChallengeConfig Error in $: key "status" not found CallStack (from HasCallStack):   error, called at src/Bilge/Response.hs:143:7 in bilge-0.22.0-inplace:Bilge.Response   responseJsonUnsafeWithMsg, called at src/Bilge/Response.hs:132:22 in bilge-0.22.0-inplace:Bilge.Response   responseJsonUnsafe, called at src/Brig/IO/Intra.hs:1405:3 in brig-2.0-inplace:Brig.IO.Intra, request=N/A
[brig] E, code=500, label=server-error, request=N/A, "Server Error"
FAIL
        Exception: Assertions failed:
         1: 200 =/= 500

[smatting]

Approved!