feat(sms): use internal ID instead of SCM id to better isolate systems

[chmccreery]

Update/amendment to #306.

Rather than pushing the SCM run id directly through Scan, we want to take a broader approach that more generally unites an SMS scan with all of its surrounding infrastructure. Therefore, we should actually use the managed_scan_id from semgrep-app rather than the id from the SCM, and let the app take care of connecting the managed_scan_id with the scm_run_id.

This is not backwards compatible, but since this field was not yet in-use, I think it makes sense to make the change anyway.

• I ran make setup && make to update the generated code after editing a .atd file (TODO: have a CI check)
• I made sure we're still backward compatible with old versions of the CLI.
  For example, the Semgrep backend need to still be able to consume data generated
  by Semgrep 1.17.0.
  See https://atd.readthedocs.io/en/latest/atdgen-tutorial.html#smooth-protocol-upgrades

[github-actions]

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