[wasm] CI improvements

[radical]

• Improve detection of darc updates allowing the use of specific dependency updates to control triggering of builds. Example: emsdk update should only trigger wasm builds
  • This is difficult right now because the version gets updated in eng/Versions.props, but since it has lot of other things too, all the builds get triggered.
  • If instead the darc version properties were in a separate file, then we could easily figure out if only a darc dependency was updated
  • If not, then we could piece together this with a script
• webcil task should trigger only wasm builds

[ghost]

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Issue Details

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• Improve detection of darc updates allowing the use of specific dependency updates to control triggering of builds. Example: emsdk update should only trigger wasm builds
  • This is difficult right now because the version gets updated in eng/Versions.props, but since it has lot of other things too, all the builds get triggered.
  • If instead the darc version properties were in a separate file, then we could easily figure out if only a darc dependency was updated
  • If not, then we could piece together this with a script
• webcil task should trigger only wasm builds

Author:	radical
Assignees:	-
Labels:	arch-wasm, area-Infrastructure-mono
Milestone:	Future

[radical]

Moved the tasks to #74538 .