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fae53cce - Fix template injection security issues in upload-test-artifacts action identified by zizmor.

Fix template injection security issues in upload-test-artifacts action identified by zizmor. Addresses template injection vulnerabilities in the upload-test-artifacts action file flagged by the zizmor security scanner (cl/899208530). This is achieved by using environment variables instead of direct interpolation in shell scripts to prevent potential OS command injection. PiperOrigin-RevId: 903284865