Fix #488 - Use model id in twin configuration names

[kbeaugrand]

Description

What's new?

• Fix Bug: Error while updating device models #488

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Merging #497 (f56106d) into main (51bba13) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #497   +/-   ##
=======================================
  Coverage   60.39%   60.39%           
=======================================
  Files         114      114           
  Lines        3729     3729           
=======================================
  Hits         2252     2252           
  Misses       1477     1477           

Impacted Files	Coverage Δ
...rver/Controllers/v1.0/DeviceModelControllerBase.cs	85.71% <100.00%> (ø)
...zureIoTHub.Portal/Server/Services/ConfigService.cs	100.00% <100.00%> (ø)

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