DBAL3: Properly implement getDatabasePlatform?

[amotl]

About

Just exploring improvements around the spot in getDatabasePlatform() that exclusively returned CratePlatform4().

Details

Currently, it would not work that way we probably thought it would: Please find more details in inline comments.
Feedback welcome, but we also don't need to over-engineer it.
Disclaimer: A am an absolute beginner with DBAL.

/cc @seut

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