fix: Updated express instrumentation to properly instrument an array of middleware defined on a route

[bizob2828]

Description

We missed some logic in shim that wraps a middleware mounter. Middleware can be defined as an array on the 2nd arg to a router.

router.get('/path', [mw1, mw2, handler]);

This PR adds the missing logic to handle this case.

Related Issues

Closes #3472

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.65%. Comparing base (3b3ab72) to head (1a236aa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3473      +/-   ##
==========================================
- Coverage   97.75%   97.65%   -0.11%     
==========================================
  Files         414      414              
  Lines       55577    55587      +10     
  Branches        1        1              
==========================================
- Hits        54330    54282      -48     
- Misses       1247     1305      +58     

Flag	Coverage Δ
integration-tests-cjs-20.x	73.33% <0.00%> (-0.02%)	⬇️
integration-tests-cjs-22.x	73.37% <0.00%> (?)
integration-tests-cjs-24.x	74.14% <0.00%> (?)
integration-tests-esm-20.x	51.82% <0.00%> (-0.02%)	⬇️
integration-tests-esm-22.x	51.87% <0.00%> (-0.02%)	⬇️
integration-tests-esm-24.x	53.08% <0.00%> (-0.02%)	⬇️
unit-tests-20.x	88.75% <0.00%> (-0.02%)	⬇️
unit-tests-22.x	88.79% <0.00%> (?)
unit-tests-24.x	88.80% <0.00%> (?)
versioned-tests-20.x	81.11% <100.00%> (-0.32%)	⬇️
versioned-tests-22.x	81.12% <100.00%> (-0.32%)	⬇️
versioned-tests-24.x	81.05% <100.00%> (-0.32%)	⬇️

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