fix issue where guac.yaml was not being read for backend configuration

[pxp928]

Description of the PR

Introduced as part of PR: #2247, guac.yaml was not being properly read in for the backend configuration. This PR fixes this issues to allow for proper configuration set via guac.yaml.

FYI @robert-cronin

PR Checklist

• All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• All new changes are covered by tests
• If GraphQL schema is changed, make generate has been run
• If GraphQL schema is changed, GraphQL client updates/additions have been made
• If OpenAPI spec is changed, make generate has been run
• If ent schema is changed, make generate has been run
• If collectsub protobuf has been changed, make proto has been run
• All CI checks are passing (tests and formatting)
• All dependent PRs have already been merged

[funnelfiasco]

Is this something we could add tests for?

[pxp928]

Is this something we could add tests for?

Hmm I am not sure if there is a good way to test this?

[mihaimaruseac]

We could add a test that looks at the running config, but it's hard to do and doesn't have much benefit, since we expect these to change very little