ci: split examples-suite into per-SDK example components

[hubcio]

The monolithic examples-suite triggered all 6 language
suites on any single SDK change and was missing sdk-node
from depends_on. Replace with per-SDK components following
the bdd-* pattern; route via startsWith('examples-').

Also fold clock, journal, partitions, shard, simulator
into rust-cluster and add harness_derive to
rust-integration -- all previously had no CI coverage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.36%. Comparing base (782c8c3) to head (5368ed0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2899      +/-   ##
============================================
- Coverage     70.37%   70.36%   -0.01%     
  Complexity      763      763              
============================================
  Files          1041     1041              
  Lines         86433    86435       +2     
  Branches      62707    62718      +11     
============================================
- Hits          60829    60822       -7     
+ Misses        23079    23077       -2     
- Partials       2525     2536      +11     

Flag	Coverage Δ
csharp	67.43% <ø> (-0.19%)	⬇️
go	36.37% <ø> (ø)
java	55.15% <ø> (ø)
node	91.40% <ø> (-0.23%)	⬇️
python	81.43% <ø> (ø)
rust	70.69% <ø> (+0.01%)	⬆️

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see 16 files with indirect coverage changes

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