[fix/processmanager] Fix accidental process manager result inversion

[felix-schwarz]

Description

Removes accidental result inversion that led to unwanted HTTP request removals/reschedules by other processes, fixing finding (4) in #1362.

Related Issue

#1362

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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