Feat(auth): Remove auth provider entity (#6314)

**What**
- remove auth provider entity

**Why**
- The auth provider entity was not really used anywhere

**How**
- Keeping loader behavior as is but removing the 

Co-authored-by: Sebastian Rindom <7554214+srindom@users.noreply.github.com>

packages/auth/integration-tests/__tests__/services/auth-user/index.spec.ts

@@ -3,7 +3,6 @@ import ContainerLoader from "../../../../src/loaders/container"
 import { MikroOrmWrapper } from "../../../utils"
 import { SqlEntityManager } from "@mikro-orm/postgresql"
 import { asValue } from "awilix"
-import { createAuthProviders } from "../../../__fixtures__/auth-provider"
 import { createAuthUsers } from "../../../__fixtures__/auth-user"
 import { createMedusaContainer } from "@medusajs/utils"
 
@@ -26,7 +25,6 @@ describe("AuthUser Service", () => {
 
     service = container.resolve("authUserService")
 
-    await createAuthProviders(testManager)
     await createAuthUsers(testManager)
   })
 
@@ -66,7 +64,7 @@ describe("AuthUser Service", () => {
 
     it("should list authUsers by provider_id", async () => {
       const authUsers = await service.list({
-        provider_id: "manual",
+        provider: "manual",
       })
 
       const serialized = JSON.parse(JSON.stringify(authUsers))
@@ -103,7 +101,7 @@ describe("AuthUser Service", () => {
 
     it("should listAndCount authUsers by provider_id", async () => {
       const [authUsers, count] = await service.listAndCount({
-        provider_id: "manual",
+        provider: "manual",
       })
 
       expect(count).toEqual(2)
@@ -227,7 +225,7 @@ describe("AuthUser Service", () => {
       await service.create([
         {
           id: "test",
-          provider_id: "manual",
+          provider: "manual",
           entity_id: "test",
           scope: "store",
         },