gitlab-advanced-sast-cpp: enable Security Execution Policies (SEP)

Problem to solve

Advanced SAST now supports C/C++ in SAST support for C and C++: Beta release (&18368 - closed) • Hua Yan • 18.4. The Scan Execution Policy (SEP) is a cross-cutting feature that should be supported by all analyzers. We need to add gitlab-advanced-sast-cpp to SEP.

Reference

#575671 (comment 2851664669)

/cc @efeller @cwidstrom

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