Populate a list of machines with machines that might not yet be persisted on disk

What does this MR do?

This tries to solve the issue described in: #2342 (comment 69862409).

This also solves issues with #3424 (closed) since this merge request prevents from creating too many instances so we don't consume the AWS API that much and prevent from being rate limited.

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • Added for this feature/bug
  • All builds are passing
• Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Closes #2342 (closed) Related to #3424 (closed)

mentioned in issue #2342 (closed)

added ~2278654 typebug executordocker-machine labels

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• 7b3d3dc8 - Populate a list of machines with machines that might not yet be persisted on disk

Compare with previous version

added customer label

changed milestone to %11.0

User confirmed the fix, let's try to make this real for %11.0

mentioned in issue #3424 (closed)

changed milestone to %11.5

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assigned to @tmaczukin

changed milestone to %12.1

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changed milestone to %12.2

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changed the description

added [Deprecated] Category:Runner devopsverify grouprunner labels and removed 1 deleted label

@ayufan It looks OK. But can we add some tests for this?