[CPU] Apply 'readability-avoid-nested-conditional-operator' clang-tidy remarks

[aobolensk]

Details:

• Fix "readability-avoid-nested-conditional-operator" remarks reported by clang-tidy
• Enable "readability-avoid-nested-conditional-operator" clang-tidy checks on CI by default

Tickets:

• N/A

[Copilot]

Pull Request Overview

This PR fixes readability-avoid-nested-conditional-operator clang-tidy remarks by replacing nested ternary expressions with equivalent if/else structures (often wrapped in immediately-invoked lambdas) across the Intel CPU plugin code and re-enables the check in CI.

• Converted deeply nested ?: chains to clear if/else logic or lambdas in various nodes and kernels
• Added <utility> include to support structured bindings
• Re-enabled the readability-avoid-nested-conditional-operator check in .clang-tidy

Reviewed Changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/plugins/intel_cpu/src/nodes/multiclass_nms.cpp	Replaced nested ternary for real_num_classes
src/plugins/intel_cpu/src/nodes/matrix_nms.cpp	Replaced nested ternary for real_num_classes
src/plugins/intel_cpu/src/nodes/kernels/x64/brgemm_kernel.cpp	Broke ternaries into if/else for several fields
src/plugins/intel_cpu/src/nodes/istft.cpp	Expanded ternary to if/else for final length
src/plugins/intel_cpu/src/nodes/interpolate.cpp	Replaced ternary for eltInGrid with if/else
src/plugins/intel_cpu/src/nodes/executors/interpolate.cpp	Replaced ternary for eltInGrid with lambda
src/plugins/intel_cpu/src/nodes/input.cpp	Normalized auto const* to const auto*
src/plugins/intel_cpu/src/nodes/gather.cpp	Expanded ISA detection ternary to if/else
src/plugins/intel_cpu/src/nodes/fake_quantize.cpp	Multiple nested ternaries refactored
src/plugins/intel_cpu/src/nodes/eltwise.cpp	Converted nested conditional for implType
src/plugins/intel_cpu/src/nodes/depth_to_space.cpp	Replaced ternary for layoutType
src/plugins/intel_cpu/src/nodes/deconv.cpp	Expanded channel block and format tag ternaries
src/plugins/intel_cpu/src/nodes/conv.cpp	Expanded ternaries for autoPadding
src/plugins/intel_cpu/src/nodes/bin_conv.cpp	Replaced multiple nested ternaries
src/plugins/intel_cpu/src/infer_request.cpp	Replaced nested conditional for shape
src/plugins/intel_cpu/src/emitters/plugin/x64/jit_emitter.cpp	Expanded vector length ternary
src/plugins/intel_cpu/src/emitters/plugin/x64/debug_capabilities.cpp	Broke VMM save/restore ternaries into if/else
src/plugins/intel_cpu/src/cpu_streams_calculation.cpp	Expanded thread/stream selection ternaries
src/plugins/intel_cpu/src/cpu_memory.cpp	Replaced clamp ternary with std::min/std::max
src/plugins/intel_cpu/src/.clang-tidy	Re-enabled nested-conditional-operator check