Filter out .NET Core 3.1 NuGet tests in prerelease versions

[andrewlock]

Summary of changes

Skips the .NET Core 3.1 NuGet dotnet-tool installer tests on prerelease versions

Reason for change

The --prerelease flag isn't available < .NET 6, so we can't easily install the prerelease package in these runtime images

Implementation details

Just skip these smoke tests on <.NET 6. It's only a specific case of the NuGet install with these earlier runtimes, so it's very low risk

Test coverage

It should run in this branch, but when we rebase v3-main on top, it shouldn't run

Other details

[gleocadie]

LGTM

[datadog-ddstaging]

Datadog Report

Branch report: andrew/ci/skip-netcoreapp31-tests-in-prerelease
Commit report: 93fce3b
Test service: dd-trace-dotnet

✅ 0 Failed, 345583 Passed, 1763 Skipped, 13h 45m 16.94s Total Time

[andrewlock]

Execution-Time Benchmarks Report ⏱️

Execution-time results for samples comparing the following branches/commits:

• This PR (5773)
• master

Execution-time benchmarks measure the whole time it takes to execute a program. And are intended to measure the one-off costs. Cases where the execution time results for the PR are worse than latest master results are shown in red. The following thresholds were used for comparing the execution times:

• Welch test with statistical test for significance of 5%
• Only results indicating a difference greater than 5% and 5 ms are considered.

Note that these results are based on a single point-in-time result for each branch. For full results, see the dashboard.

Graphs show the p99 interval based on the mean and StdDev of the test run, as well as the mean value of the run (shown as a diamond below the graph).

gantt
    title Execution time (ms) FakeDbCommand (.NET Framework 4.6.2) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (5773) - mean (72ms)  : 65, 80
     .   : milestone, 72,
    master - mean (72ms)  : 63, 82
     .   : milestone, 72,

    section CallTarget+Inlining+NGEN
    This PR (5773) - mean (1,018ms)  : 995, 1041
     .   : milestone, 1018,
    master - mean (1,013ms)  : 991, 1035
     .   : milestone, 1013,

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gantt
    title Execution time (ms) FakeDbCommand (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (5773) - mean (112ms)  : 106, 118
     .   : milestone, 112,
    master - mean (109ms)  : 106, 113
     .   : milestone, 109,

    section CallTarget+Inlining+NGEN
    This PR (5773) - mean (706ms)  : 683, 729
     .   : milestone, 706,
    master - mean (708ms)  : 685, 731
     .   : milestone, 708,

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gantt
    title Execution time (ms) FakeDbCommand (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (5773) - mean (94ms)  : 90, 98
     .   : milestone, 94,
    master - mean (93ms)  : 90, 97
     .   : milestone, 93,

    section CallTarget+Inlining+NGEN
    This PR (5773) - mean (662ms)  : 633, 692
     .   : milestone, 662,
    master - mean (658ms)  : 634, 682
     .   : milestone, 658,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET Framework 4.6.2) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (5773) - mean (191ms)  : 187, 194
     .   : milestone, 191,
    master - mean (190ms)  : 187, 194
     .   : milestone, 190,

    section CallTarget+Inlining+NGEN
    This PR (5773) - mean (1,106ms)  : 1088, 1124
     .   : milestone, 1106,
    master - mean (1,108ms)  : 1088, 1128
     .   : milestone, 1108,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (5773) - mean (275ms)  : 270, 279
     .   : milestone, 275,
    master - mean (276ms)  : 272, 279
     .   : milestone, 276,

    section CallTarget+Inlining+NGEN
    This PR (5773) - mean (876ms)  : 847, 904
     .   : milestone, 876,
    master - mean (881ms)  : 860, 903
     .   : milestone, 881,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (5773) - mean (265ms)  : 260, 270
     .   : milestone, 265,
    master - mean (264ms)  : 260, 267
     .   : milestone, 264,

    section CallTarget+Inlining+NGEN
    This PR (5773) - mean (865ms)  : 833, 898
     .   : milestone, 865,
    master - mean (859ms)  : 837, 882
     .   : milestone, 859,

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