Upgrade to Unity 6

[nowsprinting]

Changes

• Upgrade Unity to 6000.0.43f1 (The version just before Unity Test Framework became a core package)
• Fix Unity versions used to run tests on CI
• Uninstall net.tnrd.nsubstitute package
• Install NSubstitute NuGet package v5.3.0
• Install NSubstitute.Analyzers.CSharp NuGet package v1.0.17
• Add UnityOneTimeSetUp and TearDown attribute examples (UTF 1.5+)
• Add IPrebuildSetupWithTestData examples (UTF 1.6+)
• Install NUnit Analyzers NuGet package v3.9.0

[github-actions]

Code Metrics Report

	master (3187077)	#39 (59fb9c5)	+/-
Coverage	40.6%	40.3%	-0.3%
Code to Test Ratio	1:3.7	1:3.9	+0.1
Test Execution Time	4m42s	4m48s	+6s

Details

  |                     | master (3187077) | #39 (59fb9c5) |  +/-  |
  |---------------------|------------------|---------------|-------|
- | Coverage            |            40.6% |         40.3% | -0.3% |
  |   Files             |               25 |            25 |     0 |
  |   Lines             |              475 |           478 |    +3 |
  |   Covered           |              193 |           193 |     0 |
+ | Code to Test Ratio  |            1:3.7 |         1:3.9 |  +0.1 |
  |   Code              |             1251 |          1255 |    +4 |
+ |   Test              |             4748 |          4996 |  +248 |
- | Test Execution Time |            4m42s |         4m48s |   +6s |

Code coverage of files in pull request scope (0.0% → 0.0%)

Files	Coverage	+/-	Status
Assets/InputSystemExample/Scripts/Runtime/Input/PlayerInputActions.cs	0.0%	0.0%	modified

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Reported by octocov