modularize terratest into 16 /v2 submodules with a go.work workspace

Splits the single module into per-domain modules under modules/<name>/, each declaring github.com/gruntwork-io/terratest/modules/<name>/v2. Tier-0 utilities (logger, testing, retry, random, files, shell) and the relocated internal helpers (collections, formatting) collapse into modules/core/v2. examples/ and test/ stay in the root module. All cross-module imports are rewritten to their /v2 paths, and a root go.work resolves every submodule locally for development.

Author: james00012

cmd/pick-instance-type/main.go

@@ -50,7 +50,7 @@ aws.FetchFilesFromInstanceContext(t, ctx, awsRegion, sshUserName, keyPair, appSe
 Finally, to put all of this together, in your go test you could do something like:
 
 ```go
-defer test_structure.RunTestStage(t, "grab_logs", func() {
+defer teststructure.RunTestStage(t, "grab_logs", func() {
 	if t.Failed() {
 		takeElkMultiClusterLogSnapshot(t, examplesDir, awsRegion, "ubuntu")
 	}

cmd/terratest_log_parser/main.go

@@ -0,0 +1,21 @@
+go 1.26.0
+
+use (
+	.
+	./modules/core
+	./modules/ssh
+	./modules/httphelper
+	./modules/dnshelper
+	./modules/docker
+	./modules/packer
+	./modules/database
+	./modules/opa
+	./modules/aws
+	./modules/azure
+	./modules/gcp
+	./modules/k8s
+	./modules/helm
+	./modules/terraform
+	./modules/terragrunt
+	./modules/teststructure
+)