Enforce survey URL length in UI

[cconard96]

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Description

Fixes #18804
Enforce the maximum length of an external survey URL in the UI

[trasher]

Tests are failing

[cedric-anne]

The max length of inline rows in MySQL is 65535 bytes. The glpi_entities table has many rows and using 8096 for 2 of them is not possible without riching this limit. I guess we could use TEXT datatype instead of VARCHAR. This field is unlikely to be used in search operations, and there is a cache on entities configuration that will mitigate any negative performance impact.

[trasher]

Also, +1 for using text type, I was wondering if initial proposed change was a good idea.

[cconard96]

PR has been changed to only enforce the max length in the UI to avoid user confusion

[trasher]

I'm not sure limiting an URL to 255 characters is the right solution.... Some URLs may be way longer.