Updated copyright headers, fix code coverage reports

[TimHess]

• Update copyright headers to be a bit more streamlined and point to the full license file
• Improve CI pipeline to address loss of code coverage due to enabling deterministic builds

[codecov]

Codecov Report

Merging #345 into 2.x will decrease coverage by 10.30%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              2.x     #345       +/-   ##
===========================================
- Coverage   81.48%   71.17%   -10.31%     
===========================================
  Files           3      804      +801     
  Lines          27    23176    +23149     
  Branches        3     4222     +4219     
===========================================
+ Hits           22    16496    +16474     
- Misses          5     5508     +5503     
- Partials        0     1172     +1172     

Impacted Files	Coverage Δ
...x.MetricsEventsCore/CancellationTokenExtensions.cs	100.00% <ø> (ø)
...sCore/Controllers/HystrixConfigStreamController.cs	100.00% <ø> (ø)
...Core/Controllers/HystrixMetricsStreamController.cs	100.00% <ø> (ø)
...Controllers/HystrixRequestEventStreamController.cs	100.00% <ø> (ø)
...ntsCore/Controllers/HystrixStreamBaseController.cs	74.00% <ø> (ø)
.../Controllers/HystrixUtilizationStreamController.cs	100.00% <ø> (ø)
...sEventsCore/HystrixApplicationBuilderExtensions.cs	0.00% <ø> (ø)
...csEventsCore/HystrixServiceCollectionExtensions.cs	91.30% <ø> (ø)
...StreamAutofac/HystrixContainerBuilderExtensions.cs	40.00% <ø> (ø)
...tricsStreamAutofac/RabbitMetricsStreamPublisher.cs	14.28% <ø> (ø)
... and 975 more

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[TimHess]

CodeCov will fail until this PR is merged: codecov/codecov-exe#105

[jkonicki]

Copyright update looks good. I think you need to fix the comment referring to 3.1.300 to post 3.1.300, since it doesn't address all the problems we have.

[jkonicki]

Fix the note about the 3.1.300 to post-3.1.300