feat(diagnose): default --enable-templating to true

Google Cloud Deploy generates the effective Skaffold config during its
render phase by invoking `skaffold diagnose` without passing
--enable-templating=true, so deploy parameters from the execution
environment were never interpolated into templated config fields.

Flip the flag default to true so templating is applied by default while
still allowing users to opt out with --enable-templating=false.
Regenerate the CLI reference docs to reflect the new default.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: bogdannazarenko

cmd/skaffold/app/cmd/diagnose.go

@@ -57,7 +57,7 @@ func NewCmdDiagnose() *cobra.Command {
 		WithCommonFlags().
 		WithFlags([]*Flag{
 			{Value: &yamlOnly, Name: "yaml-only", DefValue: false, Usage: "Only prints the effective skaffold.yaml configuration"},
-			{Value: &enableTemplating, Name: "enable-templating", DefValue: false, Usage: "Render supported templated fields with golang template engine"},
+			{Value: &enableTemplating, Name: "enable-templating", DefValue: true, Usage: "Render supported templated fields with golang template engine"},
 			{Value: &outputFile, Name: "output", Shorthand: "o", DefValue: "", Usage: "File to write diagnose result"},
 		}).
 		NoArgs(doDiagnose)

docs-v2/content/en/docs/references/cli/_index.md

@@ -1330,7 +1330,7 @@ Options:
     -c, --config='':
 	File for global configurations (defaults to $HOME/.skaffold/config)
 
-    --enable-templating=false:
+    --enable-templating=true:
 	Render supported templated fields with golang template engine
 
     -f, --filename='skaffold.yaml':