Split add and update test apis

[lampajr]

Changes proposed

• Split add and update APIs for Test creation and update
• Use POST for creation
• Use PUT for update
• Return 201 for creation
• Return 200 for update
• Update the tests accordingly

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.

[lampajr]

• Need to check the UI as this might have impacted how tests are updated

[stalep]

I think this looks good!
One question, importTest. We talked about splitting this as well or adding a field to TestExport to mark if it's new/existing or split up the method into two?
Are you thinking that's another pr or would you like to put it into this?

[lampajr]

Are you thinking that's another pr or would you like to put it into this?

yeah I was thinking to create different PRs for each specific "endpoint" so that changes are as much isolated as possible

[lampajr]

While we are here changing the exposed API, with commit 0ec59a3 I also changed the default response status for creation to 201 which should be the standard for such operations - I also updated all tests accordingly