Auth: conflicting users validation improvements (#58136)

* WIP

* add: better validation of conflict file

* add: better description of validation and ingest command

* add: check for at least one user to delete

* add: example in terraform to setup for conflicts

* Update pkg/cmd/grafana-cli/commands/conflict_user_command.go

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

* Add: print of conflict block for error

- adds conflict block to error output for validation of the file to
  easier diagnose in the file

* fix: formatting of errors

* fix: info strings improvements

* add: default 0 to blocks to check for users

* fixed: tests

* test integration

* fix strings fmt

* set store in resolver

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/cmd/grafana-cli/commands/conflict-examples/conflict_example_users.tf

@@ -0,0 +1,64 @@
+terraform {
+  required_providers {
+    grafana = {
+      source  = "grafana/grafana"
+    }
+  }
+}
+
+// Configure the Grafana Provider
+provider "grafana" {
+  url  = "http://localhost:3000/"
+  auth = "admin:admin"
+}
+
+// login conflict
+// Creating the grafana-login
+resource "grafana_user" "grafana-login" {
+  email    = "grafana_login@grafana.com"
+  login    = "GRAFANA_LOGIN@grafana.com"
+  password = "grafana_login@grafana.com"
+  is_admin = false
+}
+
+// Creating the grafana-login
+resource "grafana_user" "grafana-login-2" {
+  email    = "grafana_login_2@grafana.com"
+  login    = "grafana_login@grafana.com"
+  password = "grafana_login@grafana.com"
+  is_admin = false
+}
+
+// email conflict
+// Creating the grafana-email
+resource "grafana_user" "grafana-email" {
+  email    = "grafana_email@grafana.com"
+  login    = "grafana_email@grafana.com"
+  password = "grafana_email@grafana.com"
+  is_admin = false
+}
+
+// Creating the grafana-email
+resource "grafana_user" "grafana-email-2" {
+  email    = "GRAFANA_EMAIL@grafana.com"
+  login    = "grafana_email_2@grafana.com"
+  password = "grafana_email@grafana.com"
+  is_admin = false
+}
+
+// email and login conflict
+// Creating the grafana-user
+resource "grafana_user" "grafana-user" {
+  email    = "grafana_user@grafana.com"
+  login    = "grafana_user@grafana.com"
+  password = "grafana_user@grafana.com"
+  is_admin = false
+}
+
+// Creating the grafana-user
+resource "grafana_user" "grafana-user-2" {
+  email    = "GRAFANA_USER@grafana.com"
+  login    = "GRAFANA_USER@grafana.com"
+  password = "grafana_user@grafana.com"
+  is_admin = false
+}