adding test cases for snapshot scenario

[Saumya-R]

This PR adds comprehensive C++ test coverage for KVS (Key-Value Store) snapshot functionality, enabling the existing Python test suite to run against both Rust and C++ implementations. The changes introduce new C++ test scenarios that mirror the Python snapshot tests, along with necessary helper utilities for KVS parameter parsing and instance creation.

Key Changes:

• Extended Python test parametrization to include C++ version alongside Rust
• Added C++ implementations for four snapshot test scenarios (count, max_count, restore, paths)
• Created helper utilities for KVS parameter parsing and instance management

[github-actions]

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DEBUG: Rule 'rust_qnx8_toolchain+' indicated that a canonical reproducible form can be obtained by modifying arguments integrity = "sha256-oEubHgeZDdT0svMmBKJx7c3/2TdSI/vfwRUyDn+TPGA="
DEBUG: Repository rust_qnx8_toolchain+ instantiated at:
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Repository rule http_archive defined at:
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WARNING: For repository 'rules_rust', the root module requires module version rules_rust@0.56.0, but got rules_rust@0.61.0 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
WARNING: For repository 'rules_cc', the root module requires module version rules_cc@0.1.1, but got rules_cc@0.1.2 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
WARNING: For repository 'platforms', the root module requires module version platforms@0.0.11, but got platforms@1.0.0 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
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Analyzing: target //:license-check (93 packages loaded, 9 targets configured)

Analyzing: target //:license-check (142 packages loaded, 916 targets configured)

Analyzing: target //:license-check (163 packages loaded, 6982 targets configured)

Analyzing: target //:license-check (163 packages loaded, 6985 targets configured)

INFO: Analyzed target //:license-check (166 packages loaded, 9001 targets configured).
[13 / 14] [Prepa] Generating Dash formatted dependency file ...
INFO: From Generating Dash formatted dependency file ...:
INFO: Successfully converted 65 packages from Cargo.lock to bazel-out/k8-fastbuild/bin/formatted.txt
INFO: Found 1 target...
Target //:license.check.license_check up-to-date:
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  bazel-bin/license.check.license_check.jar
INFO: Elapsed time: 25.413s, Critical Path: 0.39s
INFO: 14 processes: 5 disk cache hit, 9 internal.
INFO: Build completed successfully, 14 total actions
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usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
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       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]

[github-actions]

The created documentation from the pull request is available at: docu-html

[Copilot]

Pull request overview

This PR extends the existing KVS snapshot test coverage by enabling Python tests to run against both Rust and C++ implementations. The changes add C++ test scenarios that parallel the Python snapshot tests, along with helper utilities for parameter parsing and KVS instance creation.

Key Changes:

• Extended Python test parametrization to include "cpp" alongside "rust"
• Added C++ implementations for four snapshot test scenarios with known failing cases marked via pytest.xfail
• Created helper utilities for parsing KVS parameters from JSON and managing KVS instances

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/python_test_cases/tests/test_cit_snapshots.py	Added "cpp" to test parametrization and marked known failures with xfail references
tests/cpp_test_scenarios/src/main.cpp	Integrated snapshot test group into the test harness
tests/cpp_test_scenarios/src/helpers/kvs_parameters.hpp	New helper for parsing KVS parameters from JSON input
tests/cpp_test_scenarios/src/helpers/kvs_instance.hpp	New helper for creating KVS instances from parsed parameters
tests/cpp_test_scenarios/src/cit/test_snapshots.hpp	Declaration of four snapshot test scenario classes
tests/cpp_test_scenarios/src/cit/test_snapshots.cpp	Implementation of snapshot test scenarios (count, max_count, restore, paths)
tests/cpp_test_scenarios/BUILD	Updated build configuration to use glob for source files

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