Migrate regression tests' default environment.

[flamingbear]

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Description

Added new convention to separate the conda environent names. Previously all images used an environment named papermill This PR updates all to append the image name to this to allow testing of more than one regression test at a time locally. All environment.yaml files have had their names appended with the appropriate image name.

Jira Issue ID

DAS-1606

Local Test Steps

Build the images and run the tests locally against any environment.

PR Acceptance Checklist

• [n/a] Acceptance criteria met
• Tests added/updated (if needed) and passing
• Documentation updated (if needed)

[owenlittlejohns]

I really like this change; it's a small thing, but I like the lack of ambiguity now in the environment names and the ability to have all the environments locally. Thanks also for humouring me and putting this in a separate PR for clarity.