GX-Entwicklung

We need to check the truncate method which was added to src/gambio_updater/classes/Migration/Configuration/Tables/GmConfigurationTableMigration.php (to truncate the key value to maximum 255 chars) because it can cause layout problems if it truncates a tag.
Maybe it could be truncating the values as well.

Steps to reproduce:

1. Have a 4.0 shop
2. Add the code below (gm_value) to the gm_configuration table with the gm_key = GM_HEAD_TRACKING_CODE

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1. Update your shop to 4.2
2. Check your gx_configurations table

select * from *gx_configurations* where `key` = 'gm_configuration/GM_HEAD_TRACKING_CODE';

Expected: the value from the gx_configurations table should be exactly the same as in the gm_configuration table.
Result: the value inside the gx_configurations is being truncated.