Fix missing EntityDescription names in Overkiz

[iMicknl]

Proposed change

The fix in #95238 caused an issue with all entities that use an EntityDescription, this fix should resolve this. Tested on 2 of my accounts and now all entities show up correctly.

(unfortunately we don't have tests for this part, thus I didn't catch it last time).

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[home-assistant]

Hey there @vlebourl, @tetienne, @nyroDev, mind taking a look at this pull request as it has been labeled with an integration (overkiz) you are listed as a code owner for? Thanks!

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[balloob]

Casting something to string meant that both None and UndefinedType (if no name was set) got turned into a string. I removed that statement and now type checking is correctly complaining.

It is better to just set name=None in the entity descriptions that need it.

[iMicknl]

I will need to have a better look here... Setting name to None in entity description won't work, because we actually want to use the name from the entity description.

There are other cases where we want to inherit the name from the device name, for example for cover entities. Since a recent change in core, it will print an error when we implicit inherit the name from the device. Looking at this at a first glance, it will require more changes to explicit set the name.

[iMicknl]

I have made a fix for now. However I should have a better look in the coming days (or shortly after the next release), to see if we can rewrite the OverkizEntity.