🧑‍💻 Add validate-pins workflow for PRs

[sjasonsmith]

Description

Adding an automated pins file validation check will alleviate burden from reviewers, and provide immediate feedback to contributors. This runs in a parallel manner, only taking a few seconds to check all files.

This consisted of several changes:

1. Update pinsformat.py to ensure a space is included if needed when concatenating certains strings. This mirrors the changes made several months ago in the Javascript version in 🧑‍💻 Update pin formatting tools #26450
2. Delete pinsformat.js, in order to standardize on Python for tools and eliminate the need to fix issues in both.
3. Add a make validate-pins option to the Makefile, which fails if format-pins makes any changes.
4. Add a github workflow to run make validate-pins automatically on pull requests that touch pins files

Description of output

This will always process all files, so that a complete summary of failures will be provided in the log. The log contains:

1. The git diff output of all modified files. Running in the workflow, this should only be the modified pins files.
2. The git status output, providing a concise list of files which were modified.

Sample of output

(Note that in this case pinsformat is actually breaking the code, that will need to be fixed before this is merged)

diff --git a/Marlin/src/pins/stm32h7/pins_BTT_SKR_V3_0_common.h b/Marlin/src/pins/stm32h7/pins_BTT_SKR_V3_0_common.h
index 1d63f40..7dc195b 100644
--- a/Marlin/src/pins/stm32h7/pins_BTT_SKR_V3_0_common.h
+++ b/Marlin/src/pins/stm32h7/pins_BTT_SKR_V3_0_common.h
@@ -538,7 +538,7 @@
       #define TFT_RESET_PIN          EXP1_04_PIN
 
       #define LCD_BACKLIGHT_PIN      EXP1_03_PIN
-      #define TFT_BACKLIGHT_PIN LCD_BACKLIGHT_PIN
+      #define TFT_BACKLIGHT_PINLCD_BACKLIGHT_PIN
 
       #define TOUCH_BUTTONS_HW_SPI
       #define TOUCH_BUTTONS_HW_SPI_DEVICE      1
HEAD detached at pull/26996/merge
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   Marlin/src/pins/lpc1768/pins_MKS_SBASE.h
	modified:   Marlin/src/pins/ramps/pins_RAMPS.h
	modified:   Marlin/src/pins/sanguino/pins_MELZI_CREALITY.h
	modified:   Marlin/src/pins/sanguino/pins_SANGUINOLOLU_11.h
	modified:   Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h
	modified:   Marlin/src/pins/stm32h7/pins_BTT_SKR_V3_0_common.h

no changes added to commit (use "git add" and/or "git commit -a")

Error: Pins files are not formatted correctly. Run "make format-pins" to fix.