fix(operator): Clean up scaling cooldowns

[silvestre]

Issue

The table scalingcooldowns will gain an entry once an app is scaled. This entry is never removed, thus a resource leak is created.

The table can get so big, that a simple select starts to take time (as there is no index on the table).

Fix

The table is now periodically cleaned by the operator.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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