slack 19.0: pre backport vitessio/vitess#18152

[timvaillancourt]

Description

This PR is an early backport of v23 PR: vitessio#18152

This PR checks that consul static credentials were actually loaded, to address a problem we saw when the consul token is valid but empty, eg: {}

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes