switch to new pre hook route

[guptaankit015]

Note

Switch prerun scripts to call api/v1/runners_instance/$RUNNER_NAME/pre_hook using Authorization: Bearer WARPBUILD_RUNNER_VERIFICATION_TOKEN and updated payload fields.

• CI Hooks:
  • Update tools/github/hooks/prerun.sh and tools/github/hooks/prerun.ps1 to call api/v1/runners_instance/$RUNNER_NAME/pre_hook instead of api/v1/job.
  • Replace X-Warpbuild-Scope-Token with Authorization: Bearer WARPBUILD_RUNNER_VERIFICATION_TOKEN and validate RUNNER_NAME env var.
  • Revise request body: remove runner_id, runner_name, and orchestrator_* fields; add vcs_workflow_run_id and vcs_workflow_run_attempt.

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