[GHA][Coverage] Expand coverage workflow test set

[mkruszyx]

WIP

Summary

This PR expands the coverage workflow from a minimal C++-only flow into a reusable multi-suite pipeline for C++, Python, and JS, and adds Python-based tooling under tools/coverage so the same flow can run both in CI and locally.

Details

• Reworked the workflow into a staged architecture:
  • build once per lane
  • run C++/Python/JS coverage in separate jobs using the same artifact
  • generate one final aggregated summary at the end
• Expanded coverage scope by adding dedicated Python and JS suites and broadening the C++ suite set.
• Added matrix-based sharding for coverage jobs to improve parallelization.
• Added per-test duration collection for all suites and merged duration reporting in the final job.
• Refactored coverage orchestration into config-driven Python tooling under tools/coverage, shared by CI and local runs.

Tickets:

• CVS-181578

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@cf6e20f). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #34202   +/-   ##
=========================================
  Coverage          ?   79.42%           
=========================================
  Files             ?     4359           
  Lines             ?   205983           
  Branches          ?        0           
=========================================
  Hits              ?   163611           
  Misses            ?    42372           
  Partials          ?        0           

Flag	Coverage Δ
cpp-runtime-cpp-cpu-shard-01-of-08	22.45% <ø> (?)
cpp-runtime-cpp-cpu-shard-02-of-08	27.96% <ø> (?)
cpp-runtime-cpp-cpu-shard-03-of-08	66.90% <ø> (?)
cpp-runtime-cpp-cpu-shard-04-of-08	20.21% <ø> (?)
cpp-runtime-cpp-cpu-shard-05-of-08	43.18% <ø> (?)
cpp-runtime-cpp-cpu-shard-06-of-08	34.63% <ø> (?)
cpp-runtime-cpp-cpu-shard-07-of-08	31.84% <ø> (?)
cpp-runtime-cpp-cpu-shard-08-of-08	26.77% <ø> (?)
cpp-runtime-js-cpu-shard-01-of-01	20.80% <ø> (?)
cpp-runtime-python-cpu-shard-01-of-05	40.26% <ø> (?)
cpp-runtime-python-cpu-shard-02-of-05	42.92% <ø> (?)
cpp-runtime-python-cpu-shard-03-of-05	27.41% <ø> (?)
cpp-runtime-python-cpu-shard-04-of-05	36.49% <ø> (?)
cpp-runtime-python-cpu-shard-05-of-05	16.55% <ø> (?)
nodejs-bindings-unit-e2e-cpu-shard-01-of-01	90.31% <ø> (?)
python-api-frontend-layer-ovc-cpu-shard-01-of-05	65.62% <ø> (?)
python-api-frontend-layer-ovc-cpu-shard-02-of-05	59.11% <ø> (?)
python-api-frontend-layer-ovc-cpu-shard-03-of-05	63.59% <ø> (?)
python-api-frontend-layer-ovc-cpu-shard-04-of-05	55.21% <ø> (?)
python-api-frontend-layer-ovc-cpu-shard-05-of-05	54.22% <ø> (?)

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