Fix: #9165

[prathamesh-patil-5090]

I've successfully implemented support for filtering by skeleton sub-label attributes in CVAT's filter system. Here's what was changed:

Changes Made

• File Modified: filters-modal.tsx

What was added:

1. Extended the getAttributesSubfields function to handle skeleton sublabels
2. Added logic to iterate through skeleton sublabels and their attributes
3. Created nested subfield structures for sublabel attributes

Closes #9165

[zhiltsov-max]

1. I can see the added attribute filters in the filter configuration, but when I add such a filter for a skeleton point attribute, it doesn't seem to apply to the shapes. The skeleton attribute works as expected.
2. While selecting the attribute for filtering, I could get the middle menu disappeared:

Probably, it will be better to keep all the intermediate menus open while their children are open and being interacted with. 3. I'm not sure the chosen approach is a good decision - it allows to select a user-defined attribute, but it doesn't allow to select a builtin attribute (e.g. occluded) or other properties of the nested annotation. I think, it might be better to allow sublabel selection for the label filter instead.

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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