Support OR conditions in visibleWhen attribute

**Is your feature request related to a problem? Please describe.**
The `visibleWhen` attribute doesn't support multiple conditions with `OR` logic. I need to show the same annotation control when either of two different choices are selected, but the syntax `visibleWhen="choice-selected:answer1,negative|choice-selected:answer2,negative"` doesn't work.

**To Reproduce**
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**Expected behavior**
The Labels control should appear when either answer1 is "negative" OR answer2 is "negative". Currently, there's no way to express multiple conditions with OR logic in `visibleWhen`.

**Suggested solution**
Support OR conditions in `visibleWhen`, such as:
`visibleWhen="choice-selected:answer1,negative|choice-selected:answer2,negative"`

Or separate `visibleWhen` attributes that are OR'd together

**Environment:**
Label Studio Online
Version 1.19.0

**Workaround**
Currently requires creating duplicate annotation controls for each condition, which creates redundant UI elements and separate annotation results.