refactor: identify temporary text values with UUID instead of text hash (DEV-2790)

[BalduinLandolt]

No description provided.

[linear]

DEV-2790 Use IDs instead of text hashes for text values

[BalduinLandolt]

There are two questions open in this PR, both marked with TODO:

1. I'm unsure if I'm missing some purge logic
2. I commented out one test because it could not be left as it was, but I also don't want to adopt it to the changed code before we talk about how tests should look like.

Apart from that, the PR is ready, I think.