Add support for 'dependsOn' for individual matrix jobs

[zmurphy-ms]

I wanted to follow up on this comment from #20 (comment).

Hmm, I need to think more about dependsOn. I thought you could "reach into" the matrix and depend on a single resulting job, but if not, then no reason to introduce that here. (In fact, this would likely be implemented as syntactic sugar on top of matrix, so we'd get the exact same level of support.)

I don't see a way to "reach into" the matrix and depend on a single resulting job. If there is a way, I'd love to hear it. If not, adding that syntactic sugar for this would be helpful.

Example pipeline:

stages:
- stage: A
  jobs:
  - job: Build
    strategy:
      matrix:
        Release:
          Configuration: Release
        Debug:
          Configuration: Debug

    steps:
    - script: |
        echo JobName = $(System.JobName)
        echo JobDisplayName = $(System.JobDisplayName)

  - job: Test
    strategy:
      matrix:
        Release:
          Configuration: Release
        Debug:
          Configuration: Debug
    # These 'dependsOn' options give a syntax error.
    # dependsOn: "BuildRelease"
    # dependsOn: "Build Release"
    # dependsOn: "Build.Release"
    # dependsOn: "A Build Release"
    # dependsOn: "Build $(System.JobName)"
    # dependsOn: "Build $(System.JobDisplayName)"

    steps:
    - script: |
        echo JobName = $(System.JobName)
        echo JobDisplayName = $(System.JobDisplayName)

[stale]

In order to consolidate to fewer feedback channels, we've moved suggestions and issue reporting to Developer Community. Sorry for any confusion resulting from this move.

[Saibamen]

Moved into Developer Community: https://developercommunity.visualstudio.com/idea/1007464/support-for-dependson-for-individual-matrix-jobs.html
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[ghost]

+1 to this. This is an extremely useful feature, esp. when the matrix items are builds done on different OSs, architectures, etc which can be later tested individually regardless of what happened to the rest.

[oggy22]

+1 to this. Our pipelines would benefit in performance if this feature was available. This is roughly oue schema:

- job: Create
   - strategy:
      - matrix:
           Createx64
              Arch: x64
           Createx86
              Arch: x86
           CreateArm64
              Arch: arm64
- job: Test
 dependsOn: Create
   - strategy:
      - matrix:
           Testx64
              Arch: x64
           Testx86
              Arch: x86
           Testxarm
              Arch: arm64

However, I don't need Testx64 to wait for CreateArm64 only for Createx64, but there is no way to express. Oftentimes, one of the create jobs takes significantly longer than the others, which makes waiting times even worse.