aws_vpc_route_table: retry read on new resource

We are seeing failures when trying to read a newly created resource.
We should retry reads in those cases to allow for eventual consistency.

internal/service/ec2/vpc_route_table.go

@@ -217,7 +217,9 @@ func resourceRouteTableRead(d *schema.ResourceData, meta interface{}) error {
 	defaultTagsConfig := meta.(*conns.AWSClient).DefaultTagsConfig
 	ignoreTagsConfig := meta.(*conns.AWSClient).IgnoreTagsConfig
 
-	routeTable, err := FindRouteTableByID(conn, d.Id())
+	outputRaw, err := tfresource.RetryWhenNewResourceNotFound(propagationTimeout, func() (interface{}, error) {
+		return FindRouteTableByID(conn, d.Id())
+	}, d.IsNewResource())
 
 	if !d.IsNewResource() && tfresource.NotFound(err) {
 		log.Printf("[WARN] Route Table (%s) not found, removing from state", d.Id())
@@ -229,6 +231,8 @@ func resourceRouteTableRead(d *schema.ResourceData, meta interface{}) error {
 		return fmt.Errorf("error reading Route Table (%s): %w", d.Id(), err)
 	}
 
+	routeTable := outputRaw.(*ec2.RouteTable)
+
 	d.Set("vpc_id", routeTable.VpcId)
 
 	propagatingVGWs := make([]string, 0, len(routeTable.PropagatingVgws))