[Security Solution] Kibana page gets unresponsive after adding the case a rule action on creating the custom rule.

[ghost]

Description
Kibana page gets unresponsive after adding the case in action when creating the custom rule.

Build Details:

Version: 7.12.0 BC1
Build: 38938
Commit: 038fd51b0474c96e4d3ae58db1308c5f8aba71bd
Artifacts: https://staging.elastic.co/7.12.0-8486f7d1/summary-7.12.0.html

Browser Details:
All

Preconditions:

1. 7.12.0 Environment should exist.
2. Auditbeat should be installed.

Steps to Reproduce:

1. Login to Kibana environment.
2. Click on the detection tab of security.
3. Click on "Manage detection rules".
4. Click on create a new rule.
5. Add the custom query.
6. In Rule action Select the "On each rule execution".
7. Select the case option.
8. Add the connector and create the case
9. After the case creation observe that the Kibana page gets unresponsive after adding the case in action

Additional Observations:

• Although the kibana got unresponsive the Cases created under rule action got available under the case tab.
• Error message is Faced too when the user adds attach the case to already triggered detection signals.
  

Impacted Test case:
N/A

Actual Result:
Kibana page gets unresponsive after adding the case in action when creating the custom rule.

Expected Result:
Kibana page should not be unresponsive and rules should be created with "case" as Rule action.

What's working:
N/A

What's not working:
This issue is occurring on both windows and Mac browsers.

Screenshot:

logs
Network Logs

Console

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[manishgupta-qasource]

Reviewed & Assigned to @MadameSheema

[MadameSheema]

Closing since is a duplicate from: #91843