[TrustyAI] Add test to verify scheduling of drift metrics

[adolfo-ab]

This PR adds a test to verify the scheduling of TrustyAI drift metrics, and improves related util functions

Description

• Adds a test to verify TrustyAI drift metric scheduling
• Improve related util functions (send inference requests, check that TrustyAI registers them)

How Has This Been Tested?

Running the test against a PSI cluster

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[github-actions]

The following are automatically added/executed:

• PR size label.
• Run pre-commit
• Run tox

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  lgtm label removed on each new commit push.
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Supported labels

{'/lgtm', '/verified', '/wip', '/hold'}

[adolfo-ab]

/verified

[rnetser]

/lgtm