[ENH] Update _continuous.py functions

[aryanpola]

Reference Issues/PRs

Fixes #2785

What does this implement/fix? Explain your changes.

Updates the _continuous functions to take the new metrics implementation. Also updates test_ad_metrics to remove prts dependency.

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].
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[TonyBagnall]

lgtm, thanks