Move [FromBody] back on base controllers, to prevent a breaking change

[bkoelman]

Follow-up of the changes in #1506 and #1503. This PR moves [FromBody] back on base controllers, to prevent a breaking change.

Effectively (all PRs combined), only [Required] is being added on non-base controllers, so that Swashbuckle makes request bodies required.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• N/A: Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (7e864a2) to head (2dcf65d).

Additional details and impacted files

@@ Coverage Diff @@ ## master #1508 +/- ## ======================================= Coverage 90.78% 90.78% ======================================= Files 346 346 Lines 11044 11044 Branches 1813 1813 ======================================= Hits 10026 10026 Misses 669 669 Partials 349 349 

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