Cleanup GitHub workflows

[rzuckerm]

This PR addresses the following:

• I fixed Find replacement for yumemi-inc/changed-files #6009
• I fixed Low quality CodeQL C# analysis #6011
• I fixed Find alternative to pietrobolcato/action-read-yaml #5354

Notes:

• It was recommended that a specific hash be used for tj-actions/changed-files to guard against supply-chain attacks. In general, I'm wondering if we should do this for all of our actions
• It was recommended that a project file be added for C# and to change the build mode to autobuild to fix the CodeQL low quality scan issue
• I found Elisity/action-read-yaml as a replacement for pietrobolcato/action-read-yaml. It is identical except it is using Node 24 instead of Node 20

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[jrg94]

Looking good!