Disable tests with echo scripts on Windows

Add "ignoredPlatforms": ["win32"] to snap tests that have echo scripts in their package.json. The echo command behaves differently on Windows (different syntax and behavior), causing these tests to fail or produce incorrect results.

Modified 7 test cases:
- associate-existing-cache
- cache-miss-command-change
- exit-code
- individual-cache-for-adt-args
- plain-terminal-ui
- task-no-trailing-newline
- test-nested-tasks

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: branchseer

packages/cli/snap-tests/associate-existing-cache/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },

packages/cli/snap-tests/cache-miss-command-change/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },

packages/cli/snap-tests/exit-code/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },

packages/cli/snap-tests/individual-cache-for-adt-args/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },

packages/cli/snap-tests/plain-terminal-ui/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_PLUS_CLI_TEST": "0",
     "VITE_DISABLE_AUTO_INSTALL": "1"

packages/cli/snap-tests/task-no-trailing-newline/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },

packages/cli/snap-tests/test-nested-tasks/steps.json

@@ -1,4 +1,5 @@
 {
+  "ignoredPlatforms": ["win32"],
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },