GREG-60: Org unit and material UI date picker

There are going to be many changes related to this issue, so do some merge requests as the development processes to keep them managable instead of waiting until the feature is completely finished.

In this merge request I have used the date picker from material UI instead of the one we previously had. I added a select-component for role type.

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• f2e9ff3a - GREG-60: Setting default value to blank, not undefined, to avoid warning

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• 1afea513 - GREG-60: Switching back to having date picker in a controller

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• c2352885 - GREG-60: Switching to textfield with select. Adding some translations

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• 5a5a1f0f - GREG-60: Fixing linting warning

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• 4640d897 - GREG-60: Not having role select in controller since it works without it

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• 097f2df6 - GREG-60: Fixing wrong validation message specified

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• f6256b8b - GREG-60: Addressing comments from code review

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resolved all threads

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• 97ea6fb2 - GREG-60: Fixing broken test

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approved this merge request

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• af1f1ed5 - GREG-60: Fixing test

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merged

mentioned in commit 8c953378