feat: Copy firmware when container starts not when it's created

[yejseo01]

Changes

• Rename the annotation variable names to be more descriptive
• Add comments above some functions to briefly describe its feture
• remove calling of remoteproc.StoreFirmware(firmwarePath) from create()
• store the original firmware path into the state annotation in create()
• Improve overused error messages
• start() now reads from the container state annotation on the original firmware path, and copies it to /lib/firmware before starting the remoteproc. This encapsulates all remoteproc driver interaction within start()

Checklist

• 🤖 This change is covered by tests as required.
• 🤹 All required manual testing has been performed.
• 📖 All documentation updates are complete.

[muchzill4]

• We need to fix all calls to RemoveFirmware as it will attempt to delete the source firmware file, not the copy
• Perhaps feat: Copy firmware when container starts not when it's created

[muchzill4]

We're still trying to delete firmware even if we didn't store it previously. I tried to better explain what I mean in delete.go. Let me know if it needs further clarification. 👍