Stringify aggregation log content

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (692dcce) 90.68% compared to head (f52c5d1) 90.68%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #186 +/- ## ========================================= Coverage 90.68% 90.68% Complexity 1030 1030 ========================================= Files 113 113 Lines 3489 3489 Branches 275 275 ========================================= Hits 3164 3164 Misses 214 214 Partials 111 111 ``` | [Files](https://app.codecov.io/gh/OpenConext/OpenConext-myconext/pull/186?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenConext) | Coverage Δ | | |---|---|---| | [...ava/myconext/aa/AttributeAggregatorController.java](https://app.codecov.io/gh/OpenConext/OpenConext-myconext/pull/186?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenConext#diff-bXljb25leHQtc2VydmVyL3NyYy9tYWluL2phdmEvbXljb25leHQvYWEvQXR0cmlidXRlQWdncmVnYXRvckNvbnRyb2xsZXIuamF2YQ==) | `95.65% <100.00%> (ø)` | |

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