Add security issue template and update issue prefixes #3397

Job	Run time
ubuntu-24.04.clang.openmpi.python-3.12	2m 49s
windows-latest.gcc.exe.msmpi.python-3.13	4m 13s
windows-11-arm.cl.exe.msmpi.python-3.13	5m 43s
ubuntu-24.04.gcc-13.openmpi.python-3.12	2m 47s
	15m 32s

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