fix: Add env override back to C device services

This is required since the C Device services don't implement common config yet.

Note: MQTT bus override will not be generated and if needed have to be added by hand.

Also add work around for bacnet command still having old --confdir flag

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PR Checklist

Please check if your PR fulfills the following requirements:

[x] I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
[x] I have fully tested (add details below) this the new feature or bug fix (if not, why?)
[ ] I have opened a PR for the related docs change (if not, why?)

run compose builder make run ds-bacnet ds-coap no-secty Verify the service bootstrap successfully