GitHub dependency graph integration should support multiple submissions within same workflow job

[michaelbprice]

There are circumstances, such as projects organized as monorepos, where a single workflow job will need to call vcpkg multiple times to complete their build. Currently, the GitHub dependency graph integration does not support multiple invocations from the same workflow job.

[flichtenheld]

Just to clarify: You can run separate invocations in the same workflow, but not the same job. This is because vcpkg always uses the correlator value of "-" and so multiple invocations in the same job will overwrite each other. Invocations in separate jobs will be treated as separate submissions by GitHub.