[Backport] Avoid NPE in set_security_user without security #53543
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If security was disabled (explicitly), then the SecurityContext would be null, but the set_security_user processor was still registered. Attempting to define a pipeline that used that processor would fail with an (intentional) NPE. This behaviour, introduced in elastic#52032, is a regression from previous releases where the pipeline was allowed, but was no usable. This change restores the previous behaviour (with a new warning). Backport of: elastic#52691
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If security was disabled (explicitly), then the SecurityContext would
be null, but the set_security_user processor was still registered.
Attempting to define a pipeline that used that processor would fail
with an (intentional) NPE. This behaviour, introduced in #52032, is a
regression from previous releases where the pipeline was allowed, but
was no usable.
This change restores the previous behaviour (with a new warning).
Backport of: #52691