[Core] Fix Concat::evaluate segfault for sub-byte types (#38057) - #38076
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[Core] Fix Concat::evaluate segfault for sub-byte types (#38057)#38076Devarsh-7 wants to merge 2 commits into
Devarsh-7 wants to merge 2 commits into
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…kit#38057) ### Details: - Support all sub-byte element types (u1, u2, u4, i4, nf4, f4e2m1) in reference::concat / Concat::evaluate by scaling slice byte size and offsets according to element bitwidth. - Fix input offset calculation across steps in reference::concat for sub-byte types (previously in_offset was computed using element count instead of byte count before size /= 2). - Resolves segmentation fault when constant folding horizontally fused Q2_0 weights in the GPU plugin. - Add unit tests for Concat::evaluate with sub-byte types (u1, u2, u4). ### Tickets: - openvinotoolkit#38057
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