consolidate workflow files to display CI workflow graph under workflow summary page

[ilaflott]

Description
collapse main, main_expensive, distcheck workflow files --> one main workflow file with the same exact task dependencies

Closes #408

How Has This Been Tested?
see checks, specifically the summary

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[ilaflott]

now there's one spot to click for the action this PR launched, and in the actions tab, it looks like the attached screenshot

🤌 🤌 🤌

[ilaflott]

this is less indented than before. according to github doc + gemini, it appears the environment variable should be read appropriately all the same. github shoves the environment variables into the container for you by assumption.

[ilaflott]

closing as superseded by #410