fix: correct workflow output reference for external PR tests

[sundargthb]

Issue #, if available:

Description of changes:

Problem

External contributor PRs were not triggering integration tests. Both check-access-and-checkout and safety-gate jobs were being skipped.

Root Cause

The workflow referenced steps.safety-check.outputs.safe but github-script action stores return values in steps.safety-check.outputs.result.

This caused should-run output to be undefined, failing both job conditions:

• check-access-and-checkout needs should-run == 'true'
• safety-gate needs should-run == 'false'

Fix

Changed from:

should-run: ${{ steps.safety-check.outputs.safe }}

To:

should-run: ${{ steps.safety-check.outputs.result }}

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