TrigP1Test: delete test_trigP1_v1Dev_fork_build.py

Remove ART test running 8 forks and 1 thread. Uses a lot of memory and
we are not using this configuration anywhere in production.

Trigger/TrigValidation/TrigP1Test/test/test_trigP1_v1Dev_fork_build.py

-#!/usr/bin/env python
-# Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
-
-# art-description: athenaHLT test of the Dev_pp_run3_v1 menu with multiple forks
-# art-type: build
-# art-include: main/Athena
-# art-include: 24.0/Athena
-
-from TrigValTools.TrigValSteering import Test, ExecStep, CheckSteps
-
-ex = ExecStep.ExecStep()
-ex.type = 'athenaHLT'
-ex.job_options = 'TriggerJobOpts.runHLT'
-ex.input = 'data'
-ex.forks = 8
-ex.threads = 1
-ex.concurrent_events = 1
-ex.flags = ['Trigger.triggerMenuSetup="Dev_pp_run3_v1_TriggerValidation_prescale"',
-            'Trigger.doLVL1=True']
-
-test = Test.Test()
-test.art_type = 'build'
-test.exec_steps = [ex]
-test.check_steps = CheckSteps.default_check_steps(test)
-
-import sys
-sys.exit(test.run())