Drop testing for macos-12

[andrewlock]

Summary of changes

The macos-12 image is deprecated, and is no longer available, so is causing build failures

Reason for change

We can't use it

Implementation details

Remove macos-12

Test coverage

Less now

Other details

macos-15 agents are available, I'll add testing for those in a separate PR

[datadog-ddstaging]

Datadog Report

Branch report: andrew/ci/drop-macos-12
Commit report: 4fd1280
Test service: dd-trace-dotnet

✅ 0 Failed, 236452 Passed, 1971 Skipped, 18h 51m 17.06s Total Time

[andrewlock]

Execution-Time Benchmarks Report ⏱️

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

• This PR (6572)
• 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 (6572) - mean (69ms)  : 66, 71
     .   : milestone, 69,
    master - mean (69ms)  : 65, 73
     .   : milestone, 69,

    section CallTarget+Inlining+NGEN
    This PR (6572) - mean (986ms)  : 959, 1013
     .   : milestone, 986,
    master - mean (987ms)  : 962, 1013
     .   : milestone, 987,

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gantt
    title Execution time (ms) FakeDbCommand (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6572) - mean (108ms)  : 106, 110
     .   : milestone, 108,
    master - mean (107ms)  : 105, 109
     .   : milestone, 107,

    section CallTarget+Inlining+NGEN
    This PR (6572) - mean (680ms)  : 666, 694
     .   : milestone, 680,
    master - mean (681ms)  : 668, 695
     .   : milestone, 681,

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gantt
    title Execution time (ms) FakeDbCommand (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6572) - mean (91ms)  : 89, 93
     .   : milestone, 91,
    master - mean (91ms)  : 89, 93
     .   : milestone, 91,

    section CallTarget+Inlining+NGEN
    This PR (6572) - mean (635ms)  : 621, 650
     .   : milestone, 635,
    master - mean (635ms)  : 620, 650
     .   : milestone, 635,

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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 (6572) - mean (192ms)  : 187, 196
     .   : milestone, 192,
    master - mean (190ms)  : 186, 195
     .   : milestone, 190,

    section CallTarget+Inlining+NGEN
    This PR (6572) - mean (1,096ms)  : 1064, 1128
     .   : milestone, 1096,
    master - mean (1,087ms)  : 1060, 1114
     .   : milestone, 1087,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6572) - mean (275ms)  : 272, 279
     .   : milestone, 275,
    master - mean (276ms)  : 270, 281
     .   : milestone, 276,

    section CallTarget+Inlining+NGEN
    This PR (6572) - mean (869ms)  : 842, 897
     .   : milestone, 869,
    master - mean (863ms)  : 839, 886
     .   : milestone, 863,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6572) - mean (264ms)  : 258, 270
     .   : milestone, 264,
    master - mean (264ms)  : 260, 269
     .   : milestone, 264,

    section CallTarget+Inlining+NGEN
    This PR (6572) - mean (856ms)  : 808, 905
     .   : milestone, 856,
    master - mean (847ms)  : 808, 886
     .   : milestone, 847,

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