Change failed test message to use lucene.testsettings.json instead of .runsettings

[paulirwin]

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Task description

When a unit test fails, it prints a message instructing the user on how they can set the random seed and culture to reproduce the test. The output today looks like:

To reproduce this test result:

Option 1:

 Apply the following assembly-level attributes:

[assembly: Lucene.Net.Util.RandomSeed("0x9a2b7430d6d33f0d")]
[assembly: NUnit.Framework.SetCulture("en-IE")]

Option 2:

 Use the following .runsettings file:

<RunSettings>
  <TestRunParameters>
    <Parameter name="tests:seed" value="0x9a2b7430d6d33f0d" />
    <Parameter name="tests:culture" value="en-IE" />
  </TestRunParameters>
</RunSettings>

See the .runsettings documentation at: https://docs.microsoft.com/en-us/visualstudio/test/configure-unit-tests-by-using-a-dot-runsettings-file.

The .runsettings option is more verbose than the lucene.testsettings.json version, it requires structuring the XML properly to work, and has the extra documentation link that could be removed with the JSON approach. This message could instead look like:

To reproduce this test result:

Option 1:

 Apply the following assembly-level attributes:

[assembly: Lucene.Net.Util.RandomSeed("0x9a2b7430d6d33f0d")]
[assembly: NUnit.Framework.SetCulture("en-IE")]

Option 2:

 Create the following lucene.testsettings.json file somewhere between the test assembly and your root drive:

{
  "tests": {
     "seed": "0x9a2b7430d6d33f0d",
     "culture": "en-IE"
  }
}