cleanup: cleanup usage of getSecurityManager() #13993

Job	Run time
Build Clusters on JDK 17	9m 29s
Build Clusters on JDK 26-ea	7m 39s
Build Clusters on JDK 25	7m 13s
NetBeans on nb-javac	0s
IDE Modules on Linux/JDK 17	21m 16s
Build-System / Misc Tests on Linux/JDK 17	14m 4s
Check Paperwork on Linux/JDK 17	11m 57s
CV on windows-latest/JDK 17	12m 28s
CV on ubuntu-latest/JDK 26-ea	6m 8s
CV on ubuntu-latest/JDK 17	9m 4s
Build-Tools on Linux/JDK ${{ matrix.java }}	0s
CV on macos-latest/JDK 17	19m 41s
Java Hints ${{ matrix.config }} on Linux/JDK ${{ matrix.java }}	0s
LSP tests on Linux/JDK ${{ matrix.java }}	0s
Rust on Linux/JDK ${{ matrix.java }}	0s
Groovy on Linux/JDK ${{ matrix.java }}	0s
Platform Modules batch2 on Linux/JDK ${{ matrix.java }}	0s
Web Modules on Linux/JDK ${{ matrix.java }}	0s
DB Tests with MySQL on Linux/JDK ${{ matrix.java }}	0s
Profiler on Linux/JDK ${{ matrix.java }}	0s
Java Modules on Linux/JDK ${{ matrix.java }}	0s
Java Debugger tests on Linux/JDK ${{ matrix.java }}	0s
JavaFX on Linux/JDK ${{ matrix.java }}	0s
Build ${{ matrix.config }} from src.zip on JDK ${{ matrix.java }}	0s
Enterprise on Linux/JDK ${{ matrix.java }}	0s
Versioning Modules on Linux/JDK ${{ matrix.java }}	0s
PHP on ${{ matrix.os }}/JDK ${{ matrix.java }}	0s
Platform Modules batch1 on Linux/JDK ${{ matrix.java }}	0s
GraalVM ${{ matrix.graal }} Tests	0s
Cleanup Workflow Artifacts	3s
	1h 59m 2s

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