Work around some docker pull limits

[andrewlock]

Summary of changes

Add localImage: true when the agent has already been pre-pulled

Reason for change

We see occasional API limits being hit, despite pre-pulling the docker images in some cases. We can set localImage: true for these cases, which means we can use the local image instead.

Implementation details

In some cases we currently can't pre-pull the image. This applies primarily to Windows images (well, we don't do this currently, but maybe we could/should), or images where we use the Microsoft hosted agents instead of our own

Test coverage

This is the test, plus this explicit run

[datadog-ddstaging]

Datadog Report

Branch report: andrew/ci/work-around-some-docker-limits
Commit report: 8e64f52
Test service: dd-trace-dotnet

✅ 0 Failed, 244559 Passed, 2402 Skipped, 18h 39m 47.28s Total Time

[andrewlock]

Execution-Time Benchmarks Report ⏱️

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

• This PR (6617)
• 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 (6617) - mean (69ms)  : 67, 72
     .   : milestone, 69,
    master - mean (69ms)  : 67, 71
     .   : milestone, 69,

    section CallTarget+Inlining+NGEN
    This PR (6617) - mean (995ms)  : 967, 1023
     .   : milestone, 995,
    master - mean (993ms)  : 970, 1016
     .   : milestone, 993,

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gantt
    title Execution time (ms) FakeDbCommand (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6617) - mean (103ms)  : 101, 105
     .   : milestone, 103,
    master - mean (103ms)  : 101, 105
     .   : milestone, 103,

    section CallTarget+Inlining+NGEN
    This PR (6617) - mean (677ms)  : 660, 694
     .   : milestone, 677,
    master - mean (679ms)  : 665, 692
     .   : milestone, 679,

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gantt
    title Execution time (ms) FakeDbCommand (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6617) - mean (90ms)  : 88, 92
     .   : milestone, 90,
    master - mean (90ms)  : 88, 91
     .   : milestone, 90,

    section CallTarget+Inlining+NGEN
    This PR (6617) - mean (634ms)  : 619, 650
     .   : milestone, 634,
    master - mean (633ms)  : 613, 653
     .   : milestone, 633,

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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 (6617) - mean (192ms)  : 184, 200
     .   : milestone, 192,
    master - mean (190ms)  : 183, 198
     .   : milestone, 190,

    section CallTarget+Inlining+NGEN
    This PR (6617) - mean (1,119ms)  : 1074, 1164
     .   : milestone, 1119,
    master - mean (1,096ms)  : 1061, 1131
     .   : milestone, 1096,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6617) - mean (271ms)  : 265, 277
     .   : milestone, 271,
    master - mean (269ms)  : 265, 273
     .   : milestone, 269,

    section CallTarget+Inlining+NGEN
    This PR (6617) - mean (867ms)  : 837, 897
     .   : milestone, 867,
    master - mean (861ms)  : 833, 888
     .   : milestone, 861,

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gantt
    title Execution time (ms) HttpMessageHandler (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6617) - mean (263ms)  : 258, 268
     .   : milestone, 263,
    master - mean (261ms)  : 258, 265
     .   : milestone, 261,

    section CallTarget+Inlining+NGEN
    This PR (6617) - mean (856ms)  : 820, 892
     .   : milestone, 856,
    master - mean (845ms)  : 811, 879
     .   : milestone, 845,

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