fix(snap): Refactor to avoid conflicts with readonly config provider directory

[MonicaisHer]

This PR makes changes to incorporate the following fixes:

• Move env file to parent directory to avoid conflict with config provider canonical/edgex-snap-hooks#83
• Add snapctl wrapper to check connected interfaces canonical/edgex-snap-hooks#82

Additionally, the following changes have been made:

• remove deprecated startup-duration and startup-interval options
• remove xtrace -x to reduce confusion in messages

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/device-rest-go/blob/main/.github/Contributing.md

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• 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?)

Testing Instructions

For testing instructions, please refer to edgexfoundry/device-mqtt-go#535

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #275 (b4eaadd) into main (e28169b) will not change coverage.
The diff coverage is n/a.

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  Coverage   32.86%   32.86%           
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  Files           2        2           
  Lines         353      353           
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  Hits          116      116           
  Misses        224      224           
  Partials       13       13           

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