PR 21361 broke preflight-checks.py, no env's listed

[ellensp]

Did you test the latest bugfix-2.0.x code?

Yes, and the problem still exists.

Bug Description

After #21361 preflight-checks.py no longer advises of what env's to use.

eg.
"Error: Build environment 'mega2560' is incompatible with BOARD_BTT_SKR_MINI_E3_V2_0. Use one of these:"

should say "Error: Build environment 'mega2560' is incompatible with BOARD_BTT_SKR_MINI_E3_V2_0. Use one of these: STM32F103RC_btt,STM32F103RC_btt_512K,STM32F103RC_btt_USB,STM32F103RC_btt_512K_USB"

Bug Timeline

8 hours ago

Expected behavior

A list of valid ENV's should be provided.

Actual behavior

No valid ENV's are provided.

Steps to Reproduce

1. select a non ramps mottherboard eg BOARD_BTT_SKR_MINI_E3_V2_0.
2. click build
3. look at Build environment error. It does not contain list of valid env's

Version of Marlin Firmware

bugfix

[ellensp]

going with revert instead #21372

[github-actions]

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