fix(connectors): harden plugin loading and config metadata

[hubcio]

Fall back to modified() when created() is unsupported (XFS,
Overlay2). Replace .expect() panics with proper error propagation
in config loading and path conversion.

Rewrite resolve_plugin_path to return Result and search multiple
directories (binary dir, cwd, /usr/lib, /usr/lib64, /lib, /lib64,
/usr/local/lib, /usr/local/lib64) with actionable diagnostics
when the library is not found. Add unit tests for resolution.

Rename example configs to {name}_{type}[_v{N}].toml convention
and add missing example configs for elasticsearch and postgres
connectors. Switch all connector config.toml paths from debug
to release builds. Update READMEs with plugin path resolution
docs and new config filenames. Remove WiP notice.

Bump version to 0.2.4-edge.1.

Fixes #2712

[codecov]

Codecov Report

❌ Patch coverage is 77.39130% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.64%. Comparing base (0aa1f38) to head (f5e0e2a).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...s/runtime/src/configs/connectors/local_provider.rs	15.00%	12 Missing and 5 partials ⚠️
core/connectors/runtime/src/main.rs	92.47%	5 Missing and 2 partials ⚠️
core/connectors/runtime/src/sink.rs	0.00%	0 Missing and 1 partial ⚠️
core/connectors/runtime/src/source.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2713      +/-   ##
============================================
+ Coverage     68.62%   68.64%   +0.01%     
  Complexity      637      637              
============================================
  Files           734      734              
  Lines         59660    59764     +104     
  Branches      56073    56177     +104     
============================================
+ Hits          40943    41023      +80     
- Misses        16717    16733      +16     
- Partials       2000     2008       +8     

Flag	Coverage Δ
rust	69.82% <77.39%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
core/connectors/runtime/src/sink.rs	68.71% <0.00%> (-0.28%)	⬇️
core/connectors/runtime/src/source.rs	65.73% <0.00%> (-0.29%)	⬇️
core/connectors/runtime/src/main.rs	85.97% <92.47%> (+5.37%)	⬆️
...s/runtime/src/configs/connectors/local_provider.rs	53.03% <15.00%> (-2.22%)	⬇️

... and 4 files with indirect coverage changes

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