Gracefully handle missing EF Core ref in DbMigrations

[TimHess]

Takes care of #741 in 3.2+

Should also be backported to 3.1 and 2.5

[TimHess]

Note: this PR is easier to read if you hide whitespace changes

[codecov]

Codecov Report

Merging #766 (7e7deaf) into main (b7da00d) will decrease coverage by 0.06%.
The diff coverage is 75.86%.

@@            Coverage Diff             @@
##             main     #766      +/-   ##
==========================================
- Coverage   74.29%   74.23%   -0.07%     
==========================================
  Files        1313     1313              
  Lines       45667    45669       +2     
  Branches     8955     8961       +6     
==========================================
- Hits        33929    33902      -27     
- Misses       9235     9258      +23     
- Partials     2503     2509       +6     

Impacted Files	Coverage Δ
.../EndpointBase/DbMigrations/DbMigrationsEndpoint.cs	78.26% <75.00%> (-12.65%)	⬇️
...src/EndpointCore/ActuatorRouteBuilderExtensions.cs	91.52% <100.00%> (ø)
...c/Common/src/Common.Net/WindowsNetworkFileShare.cs	84.21% <0.00%> (-7.02%)	⬇️
.../Listener/DirectReplyToMessageListenerContainer.cs	59.63% <0.00%> (-5.51%)	⬇️
...abbitMQ/Listener/DirectMessageListenerContainer.cs	72.44% <0.00%> (-1.79%)	⬇️
...e/Strategy/Concurrency/HystrixSyncTaskScheduler.cs	85.84% <0.00%> (-1.77%)	⬇️
...rc/RabbitMQ/Connection/CachingConnectionFactory.cs	58.29% <0.00%> (-0.18%)	⬇️
...gement/src/EndpointBase/ThreadDump/ThreadDumper.cs	68.04% <0.00%> (+0.82%)	⬆️

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[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[jkonicki]

Needs backport to release/3.1 and release/2.5 branch

[hananiel]

LGTM;