[C++ SDK] Added SLO workload dockerfile

[Gazizonoki]

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[Copilot]

Pull request overview

This PR adds a Dockerfile and build configuration for SLO (Service Level Objective) workloads in the C++ SDK. The changes enable building and running SLO workload tests in a containerized environment.

• Adds a comprehensive Dockerfile that sets up the complete build environment with all required dependencies
• Integrates CMake build configuration for SLO workload utilities and key-value test executable
• Adds OpenTelemetry C++ library as a dependency for metrics collection

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tests/slo_workloads/Dockerfile	New Dockerfile that installs all build dependencies (LLVM, CMake, gRPC, protobuf, abseil, etc.) and builds the slo-key-value executable
tests/slo_workloads/CMakeLists.txt	Top-level CMake file that includes key_value and utils subdirectories
tests/slo_workloads/utils/CMakeLists.txt	CMake configuration for slo-utils library with OpenTelemetry metrics support
tests/slo_workloads/key_value/CMakeLists.txt	CMake configuration for slo-key-value executable with platform-specific linking
tests/CMakeLists.txt	Updated to include slo_workloads subdirectory in the build
cmake/testing.cmake	Adds OpenTelemetry C++ v1.24.0 as a FetchContent dependency with appropriate configuration options
.gitignore	Changed pattern from !.devcontainer/Dockerfile to !Dockerfile to unignore Dockerfiles
tests/slo_workloads/.dockerignore	Removed the entire .dockerignore file that previously excluded various files from Docker context

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