Upgrade to Unity 6

[nowsprinting]

Changes

• Upgrade Unity to 6000.0.50f1
• Remove examples of using UnityTest with TestCase, TestCaseSource, Sequential, and Pairwise attributes
• Fix Unity versions used to run tests on CI
• Uninstall net.tnrd.nsubstitute package
• Add UnityNuGet registry settings
• Install NSubstitute NuGet package v5.3.0
• Install NSubstitute.Analyzers.CSharp NuGet package v1.0.17
• Install NUnit Analyzers NuGet package v3.3.0

[github-actions]

Code Metrics Report

	master (a2957bf)	#39 (f009e25)	+/-
Coverage	36.1%	38.1%	+1.9%
Code to Test Ratio	1:3.4	1:4.1	+0.7
Test Execution Time	6m7s	4m51s	-1m16s

Details

  |                     | master (a2957bf) | #39 (f009e25) |  +/-   |
  |---------------------|------------------|---------------|--------|
+ | Coverage            |            36.1% |         38.1% |  +1.9% |
  |   Files             |               27 |            25 |     -2 |
  |   Lines             |              487 |           451 |    -36 |
- |   Covered           |              176 |           172 |     -4 |
+ | Code to Test Ratio  |            1:3.4 |         1:4.1 |   +0.7 |
  |   Code              |             1299 |          1207 |    -92 |
+ |   Test              |             4443 |          5001 |   +558 |
+ | Test Execution Time |             6m7s |         4m51s | -1m16s |

Code coverage of files in pull request scope (35.6% → 39.7%)

Files	Coverage	+/-	Status
/github/workspace/Assets/APIExamples/Scripts/Editor/UnityTestFramework/CallbacksExample.cs	42.8%	-14.3%	affected
/github/workspace/Assets/InputExample/Scripts/Runtime/FirstPersonControllerLegacy.cs	9.4%	+9.4%	affected
/github/workspace/Assets/InputSystemExample/Scripts/Runtime/FirstPersonController.cs	8.3%	+8.3%	affected
/github/workspace/Assets/InputSystemExample/Scripts/Runtime/GoalPlate.cs	12.5%	+12.5%	affected
./LocalPackages/com.nowsprinting.local-package-sample/Scripts/Editor/ExampleForCoverage.cs	0.0%	-100.0%	affected
./LocalPackages/com.nowsprinting.local-package-sample/Scripts/Runtime/ExampleForCoverage.cs	0.0%	-100.0%	affected
./Packages/com.nowsprinting.embedded-package-sample/Scripts/Editor/ExampleForCoverage.cs	0.0%	-100.0%	affected
./Packages/com.nowsprinting.embedded-package-sample/Scripts/Runtime/ExampleForCoverage.cs	0.0%	-100.0%	affected
Assets/APIExamples/Scripts/Runtime/Element.cs	60.0%	0.0%	modified
Assets/BasicExample/Scripts/Runtime/Entities/CharacterStatus.cs	86.6%	0.0%	modified
Assets/BasicExample/Scripts/Runtime/Entities/Enemy.cs	0.0%	0.0%	modified
Assets/BasicExample/Scripts/Runtime/Entities/Enums/Element.cs	95.0%	-1.9%	modified
Assets/BasicExample/Scripts/Runtime/Entities/Player.cs	0.0%	0.0%	modified
Assets/BasicExample/Scripts/Runtime/Entities/ScriptableObjects/Race.cs	0.0%	0.0%	modified
LocalPackages/com.nowsprinting.local-package-sample/Editor/ExampleForCoverage.cs	100.0%	+100.0%	renamed
LocalPackages/com.nowsprinting.local-package-sample/Runtime/ExampleForCoverage.cs	100.0%	+100.0%	renamed
LocalPackages/com.nowsprinting.local-package-sample/Scripts/Editor/BuildAllScenesForTestPlayer.cs	0.0%	0.0%	removed
Packages/com.nowsprinting.embedded-package-sample/Editor/ExampleForCoverage.cs	100.0%	+100.0%	renamed
Packages/com.nowsprinting.embedded-package-sample/Runtime/ExampleForCoverage.cs	100.0%	+100.0%	renamed
Packages/com.nowsprinting.embedded-package-sample/Scripts/Editor/BuildAllScenesForTestPlayer.cs	0.0%	0.0%	removed

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Reported by octocov