Fixes for broken periodic tasks, errors during project creation + other small fixes

[akochari]

Description

This PR contains two bugfixes: SS-1163 - periodic tasks cleaning up notebooks and file managers were not working; SS-1136 - we were getting unnecessary error warnings for project-vol and project-netpolicy not having 'access' fields but they were not supposed to have that anyway.

In addition this PR contains the following minor changes:

SS-1186 - remove legacy environments from default project template
SS-1184 - add lth.se to the list of whitelisted email domains

• allow only lowercase letters in email field for granting access

Checklist

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• This pull request is against develop branch (not applicable for hotfixes)
• I have included a link to the issue on GitHub or JIRA (if any)
• I have included migration files (if there are changes to the model classes)
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• In the case I have modified settings.py, then I have also updated the studio-settings-configmap.yaml file in serve-charts

[alfredeen]

LGTM. Good work!