Skip scripts during 'platformio init' (#21643)

buildroot/share/PlatformIO/scripts/common-cxxflags.py

 # Convenience script to apply customizations to CPP flags
 #
 Import("env")
+
+# Detect that 'vscode init' is running
+from SCons.Script import COMMAND_LINE_TARGETS
+if "idedata" in COMMAND_LINE_TARGETS:
+    env.Exit(0)
+
 env.Append(CXXFLAGS=[
   "-Wno-register"
   #"-Wno-incompatible-pointer-types",

buildroot/share/PlatformIO/scripts/common-dependencies-post.py

 # common-dependencies-post.py
 # Convenience script to add build flags for Marlin Enabled Features
 #
-
 Import("env")
+
+# Detect that 'vscode init' is running
+from SCons.Script import COMMAND_LINE_TARGETS
+if "idedata" in COMMAND_LINE_TARGETS:
+    env.Exit(0)
+
 Import("projenv")
 
 def apply_board_build_flags():

buildroot/share/PlatformIO/scripts/common-dependencies.py

 # common-dependencies.py
 # Convenience script to check dependencies and add libs and sources for Marlin Enabled Features
 #
+Import("env")
+
+#print(env.Dump())
+
+# Detect that 'vscode init' is running
+from SCons.Script import COMMAND_LINE_TARGETS
+if "idedata" in COMMAND_LINE_TARGETS:
+    env.Exit(0)
+
 import subprocess,os,re
 
 PIO_VERSION_MIN = (5, 0, 3)
 from platformio.package.meta import PackageSpec
 from platformio.project.config import ProjectConfig
 
-Import("env")
-
-#print(env.Dump())
-
 try:
 	verbose = int(env.GetProjectOption('custom_verbose'))
 except:

buildroot/share/PlatformIO/scripts/copy_marlin_variant_to_framework.py

 #
 # copy_marlin_variant_to_framework.py
 #
+Import("env")
+
+# Detect that 'vscode init' is running
+from SCons.Script import COMMAND_LINE_TARGETS
+if "idedata" in COMMAND_LINE_TARGETS:
+    env.Exit(0)
+
 import os,shutil
 from SCons.Script import DefaultEnvironment
 from platformio import util

buildroot/share/PlatformIO/scripts/preflight-checks.py

 # preflight-checks.py
 # Check for common issues prior to compiling
 #
-import os,re,sys
 Import("env")
 
+# Detect that 'vscode init' is running
+from SCons.Script import COMMAND_LINE_TARGETS
+if "idedata" in COMMAND_LINE_TARGETS:
+    env.Exit(0)
+
+import os,re,sys
+
 def get_envs_for_board(board):
 	with open(os.path.join("Marlin", "src", "pins", "pins.h"), "r") as file: