Reduce the use of reflection in some rare circumstances #290
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Very slightly mitigates the impact of JENKINS-60891 in two rather rare circumstances: when the environment is not changing, and when an existing variable is being updated. This is far from a solution to JENKINS-60891, but at least it's better than nothing. A full solution would require core changes and adaptations in several other plugins, which would be a much larger effort. Meanwhile, this can't hurt and is better than the status quo.
Testing done
Manually tested that overriding the
PATH
parameter failed before this PR and succeeded after this PR on Java 17.