fix(admin): correct regex on service account mail validation
Description
How to test
https://perunaai.atlassian.net/jira/software/c/projects/STR/boards/27?selectedIssue=STR-1506
Author's checklist
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I have followed the contribution guidelines -
This MR has been tested or does not change functionality -
I have added relevant merge request dependencies (if this MR has any) -
I have added the correct labels -
I have assigned reviewers (if any are relevant) -
I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation -
I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)
Reviewer's checklist
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This MR has been tested or does not change functionality -
This MR has correct commit message format
Other information
I know that it would be nice to unify the email validation here. But there is already a task for that on board so I just stuck to fixing this small issue.
Related issues
Closes STR-1506