fix(snap): source security-bootstrapper config overrides from env file

[farshidtz]

The PR #4071 upgraded the library to generate correct environment files, and updated the env loader script accordingly. However, another env file loader logic was in the consul security bootstrapper script which was left out.

This PR removes the duplicate logic and makes the bootstrapper use the generic env file loader script.

Fixes #4284

Signed-off-by: Farshid Tavakolizadeh farshid.tavakolizadeh@canonical.com

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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

1. Download the snap from GH action snap builds or build it locally
2. Install Device MQTT and connect sudo snap install edgex-device-mqtt --edge && sudo snap connect edgexfoundry:edgex-secretstore-token edgex-device-mqtt:edgex-secretstore-token
3. (Install mosquitto sudo snap install mosquitto)
4. Start sudo snap start edgex-device-mqtt
5. Check the logs to make sure you don't see consul-related errors as reported in Missing device/app service role in consul when using snap app options #4284

New Dependency Instructions (If applicable)

[sonarqubecloud]

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3.8% Duplication

[MonicaisHer]

@farshidtz Thanks for the fix. I have run snap testing device-mqtt suite on this PR together with device-mqtt refactor PR and there is no more device-mqtt service role missing in consul.

$ PLATFORM_CHANNEL=edge/pr-4283 SERVICE_CHANNEL=edge/pr-454 go test -v --count=1 ./test/suites/device-mqtt/
ok      edgex-snap-testing/test/suites/device-mqtt      281.369s