MLPAB-2610 Prevent going to completed tasks after signing #9103

Job	Run time
Detect Changes / compare_changes	13s
TF Plan Dev Account / development account deployment	51s
Detect Changes / notify_previous_build_will_be_deployed	0s
Create Tags / generate_environment_workspace_name	1s
Create Tags / pull_s3_av_tag	13s
Create Tags / create_tags	15s
Create Tags / pull_tags	0s
Create Tags / consolidate_tags	2s
Run Go unit tests / run	1m 13s
TF Plan Preprod Account / preproduction account deployment	49s
TF Plan Prod Account / production account deployment	58s
Docker Build, Scan and Push / modernising-lpa/app	3m 22s
Docker Build, Scan and Push / modernising-lpa/create-s3-batch-replication-job	2m 35s
Docker Build, Scan and Push / modernising-lpa/event-received	2m 48s
Docker Build, Scan and Push / modernising-lpa/mock-pay	2m 34s
Docker Build, Scan and Push / modernising-lpa/schedule-runner	2m 31s
Docker Build, Scan and Push / egress-checker	1m 55s
Run Cypress UI Tests On Images / run_ui_tests	12m 11s
PR Environment Deploy / 1746 environment deployment	7m 12s
Run Cypress UI Tests On PR Environment / run_ui_tests	1m 0s
End of PR Workflow	2s
Remove CI ingress from environment / remove_ingress	18s
	41m 3s

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