Add show-full-config flag to bundle summary (#3583)

## Changes
Add a `--show-full-config` flag to `bundle summary` to load all config
files from `include` and output the config as JSON

## Why
To load the whole config for DABs in the workspace

## Tests
add acceptance test

Author: rclarey

acceptance/bundle/summary/show-full-config/databricks.yml

@@ -0,0 +1,15 @@
+include:
+  - targets/*.yml
+
+variables:
+  mode:
+    default: development
+  default:
+    default: false
+
+targets:
+  also_default:
+    mode: development
+    default: true
+    workspace:
+      host: https://example.com

acceptance/bundle/summary/show-full-config/out.test.toml

@@ -0,0 +1,43 @@
+
+>>> [CLI] bundle summary --show-full-config
+{
+  "bundle": {
+    "name": "test-bundle"
+  },
+  "include": [
+    "targets/default.yml",
+    "targets/not_default.yml",
+    "targets/variable_default.yml",
+    "targets/variable_mode.yml"
+  ],
+  "targets": {
+    "also_default": {
+      "default": true,
+      "mode": "development",
+      "workspace": {
+        "host": "https://example.com"
+      }
+    },
+    "default": {
+      "default": true,
+      "mode": "development"
+    },
+    "not_default": {
+      "mode": "production"
+    },
+    "variable_default": {
+      "default": "${var.default}"
+    },
+    "variable_mode": {
+      "mode": "${var.mode}"
+    }
+  },
+  "variables": {
+    "default": {
+      "default": false
+    },
+    "mode": {
+      "default": "development"
+    }
+  }
+}

acceptance/bundle/summary/show-full-config/output.txt

@@ -0,0 +1 @@
+trace $CLI bundle summary --show-full-config

acceptance/bundle/summary/show-full-config/script

@@ -0,0 +1,4 @@
+targets:
+  default:
+    mode: development
+    default: true

acceptance/bundle/summary/show-full-config/targets/default.yml

@@ -0,0 +1,3 @@
+targets:
+  not_default:
+    mode: production

acceptance/bundle/summary/show-full-config/targets/not_default.yml

@@ -0,0 +1,3 @@
+targets:
+  variable_default:
+    default: ${var.default}

acceptance/bundle/summary/show-full-config/targets/variable_default.yml

@@ -0,0 +1,3 @@
+targets:
+  variable_mode:
+    mode: ${var.mode}

acceptance/bundle/summary/show-full-config/targets/variable_mode.yml

@@ -0,0 +1,3 @@
+[[Repls]]
+Old = '\\\\'
+New = '/'

acceptance/bundle/summary/show-full-config/test.toml

@@ -1,6 +1,7 @@
 package bundle
 
 import (
+	"context"
 	"errors"
 	"os"
 	"path/filepath"
@@ -30,30 +31,28 @@ Useful after deployment to see what was created and where to find it.`,
 
 	var forcePull bool
 	var includeLocations bool
+	var shouldShowFullConfig bool
 	cmd.Flags().BoolVar(&forcePull, "force-pull", false, "Skip local cache and load the state from the remote workspace")
 	cmd.Flags().BoolVar(&includeLocations, "include-locations", false, "Include location information in the output")
 	cmd.Flags().MarkHidden("include-locations")
+	cmd.Flags().BoolVar(&shouldShowFullConfig, "show-full-config", false, "Load and output the full bundle config")
+	cmd.Flags().MarkHidden("show-full-config")
 
 	cmd.RunE = func(cmd *cobra.Command, args []string) error {
 		var err error
 		ctx := logdiag.InitContext(cmd.Context())
 		cmd.SetContext(ctx)
 		logdiag.SetSeverity(ctx, diag.Warning)
 
-		b := prepareBundleForSummary(cmd, forcePull, includeLocations)
-
-		if b != nil {
-			if root.OutputType(cmd) == flags.OutputText {
-				err = render.RenderSummary(ctx, cmd.OutOrStdout(), b)
-				if err != nil {
-					return err
-				}
+		if shouldShowFullConfig {
+			err = showFullConfig(ctx, cmd)
+			if err != nil {
+				return err
 			}
-			if root.OutputType(cmd) == flags.OutputJSON {
-				err = renderJsonOutput(cmd, b)
-				if err != nil {
-					return err
-				}
+		} else {
+			err = showSummary(ctx, cmd, forcePull, includeLocations)
+			if err != nil {
+				return err
 			}
 		}
 
@@ -67,6 +66,49 @@ Useful after deployment to see what was created and where to find it.`,
 	return cmd
 }
 
+func showFullConfig(ctx context.Context, cmd *cobra.Command) error {
+	// call `MustLoad` directly instead of `MustConfigureBundle` because the latter does
+	// validation that we're not interested in here
+	b := bundle.MustLoad(ctx)
+	if b == nil || logdiag.HasError(ctx) {
+		return nil
+	}
+
+	mutator.DefaultMutators(ctx, b)
+	if logdiag.HasError(ctx) {
+		return nil
+	}
+
+	err := renderJsonOutput(cmd, b)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func showSummary(ctx context.Context, cmd *cobra.Command, forcePull, includeLocations bool) error {
+	var err error
+	b := prepareBundleForSummary(cmd, forcePull, includeLocations)
+
+	if b != nil {
+		if root.OutputType(cmd) == flags.OutputText {
+			err = render.RenderSummary(ctx, cmd.OutOrStdout(), b)
+			if err != nil {
+				return err
+			}
+		}
+		if root.OutputType(cmd) == flags.OutputJSON {
+			err = renderJsonOutput(cmd, b)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 func prepareBundleForSummary(cmd *cobra.Command, forcePull, includeLocations bool) *bundle.Bundle {
 	b := utils.ConfigureBundleWithVariables(cmd)
 	ctx := cmd.Context()