EQL e2e test and integration tag (#88)

This first integrations test.

1. These will not be run on PR verification
2. You may run these tests here:
https://github.com/QuesmaOrg/quesma/actions/workflows/e2e-tests.yml

Tests are OK: 

https://github.com/QuesmaOrg/quesma/actions/runs/9061758790/job/24894224722

quesma/eql/e2e/end2end_test.go → quesma/eql/e2e/end2end_integration_test.go

@@ -1,3 +1,5 @@
+//go:build integration
+
 package e2e
 
 import (
@@ -11,15 +13,8 @@ import (
 // Tests requires Quesma and Elastic to be running.
 // Queries are run against both Quesma and Elastic and results are compared.
 
-var runTests = false
-
 func TestE2E(t *testing.T) {
 
-	if !runTests {
-		t.Skip("Tests are disabled. To enable them, set the condition to false.")
-		return
-	}
-
 	// These are the queries that are run against both Quesma and Elastic.
 	// Queries start with a "--" are skipped.
 	var eqlQueries = []string{

quesma/eql/e2e/ingest_test.go → quesma/eql/e2e/ingest_integration_test.go

@@ -1,3 +1,5 @@
+//go:build integration
+
 package e2e
 
 import (

quesma/eql/e2e/query_test.go → quesma/eql/e2e/query_integration_test.go

@@ -1,3 +1,5 @@
+//go:build integration
+
 package e2e
 
 import (