chore: changed and refactored providers (#36)

## Description

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relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Reviewed-on: #36
Reviewed-by: Marcel_Henselin <marcel.henselin@stackit.cloud>
Co-authored-by: Andre Harms <andre.harms@stackit.cloud>
Co-committed-by: Andre Harms <andre.harms@stackit.cloud>

stackit/internal/services/sqlserverflexbeta/user/datasource.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 
 	"github.com/hashicorp/terraform-plugin-framework/datasource"
+	"github.com/hashicorp/terraform-plugin-framework/types"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/core"
 	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/utils"
@@ -25,12 +26,30 @@ func NewUserDataSource() datasource.DataSource {
 	return &userDataSource{}
 }
 
+type dataSourceModel struct {
+	DefaultDatabase types.String `tfsdk:"default_database"`
+	Host            types.String `tfsdk:"host"`
+	Id              types.Int64  `tfsdk:"id"`
+	InstanceId      types.String `tfsdk:"instance_id"`
+	Port            types.Int64  `tfsdk:"port"`
+	ProjectId       types.String `tfsdk:"project_id"`
+	Region          types.String `tfsdk:"region"`
+	Roles           types.List   `tfsdk:"roles"`
+	Status          types.String `tfsdk:"status"`
+	UserId          types.Int64  `tfsdk:"user_id"`
+	Username        types.String `tfsdk:"username"`
+}
+
 type userDataSource struct {
 	client       *sqlserverflexbetaPkg.APIClient
 	providerData core.ProviderData
 }
 
-func (d *userDataSource) Metadata(_ context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) {
+func (d *userDataSource) Metadata(
+	_ context.Context,
+	req datasource.MetadataRequest,
+	resp *datasource.MetadataResponse,
+) {
 	resp.TypeName = req.ProviderTypeName + "_sqlserverflexbeta_user"
 }
 
@@ -59,7 +78,7 @@ func (d *userDataSource) Configure(
 }
 
 func (d *userDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
-	var data sqlserverflexbetaGen.UserModel
+	var data dataSourceModel
 
 	// Read Terraform configuration data into the model
 	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
@@ -72,13 +91,15 @@ func (d *userDataSource) Read(ctx context.Context, req datasource.ReadRequest, r
 
 	projectId := data.ProjectId.ValueString()
 	region := d.providerData.GetRegionWithOverride(data.Region)
-	userId := data.UserId.ValueString()
+	instanceId := data.InstanceId.ValueString()
+	userId := data.UserId.ValueInt64()
 
 	ctx = tflog.SetField(ctx, "project_id", projectId)
 	ctx = tflog.SetField(ctx, "region", region)
+	ctx = tflog.SetField(ctx, "instance_id", instanceId)
 	ctx = tflog.SetField(ctx, "user_id", userId)
 
-	userResp, err := d.client.GetUserRequest(ctx, projectId, region, userId).Execute()
+	userResp, err := d.client.GetUserRequest(ctx, projectId, region, instanceId, userId).Execute()
 	if err != nil {
 		utils.LogError(
 			ctx,