revert creation of role for agora-data-manager (#1061)

Revert creation of a role for GH OIDC because our plan shifted to using self-hosted runner insteead of a GH runner.  A role is not needed when using self-hosted runners because the self hosted runner is already setup with access to the databases.

more info in PR Sage-Bionetworks/agora-data-manager#116

This reverts commit d1f91e1 and  commit a6406aa.

org-formation/650-identity-providers/_tasks.yaml

@@ -797,25 +797,3 @@ GithubOidcAgoraEBDeploy:
       - !Ref AgoraDevAccount
       - !Ref AgoraProdAccount
     Region: us-east-1
-
-GithubOidcAgoraDataManagerDeploy:
-  Type: update-stacks
-  DependsOn: GithubOidcSageBionetworks
-  Template: https://raw.githubusercontent.com/Sage-Bionetworks/aws-infra/v0.7.6/templates/IAM/github-oidc-provider.j2
-  StackName: !Sub ${resourcePrefix}-${appName}-agora-data-manager-deploy
-  Parameters:
-    ProviderArn: !CopyValue [ !Sub '${resourcePrefix}-${appName}-ProviderArn' ]
-    ProviderRoleName: !Sub ${resourcePrefix}-${appName}-agora-data-manager-deploy
-    MaxSessionDuration: 3600
-    ManagedPolicyArns:
-      - "arn:aws:iam::aws:policy/AmazonDocDBFullAccess"
-  TemplatingContext:
-    GitHubOrg: "Sage-Bionetworks"
-    Repositories:
-      - name: "Agora"
-        branches: ["develop", "prod", "staging"]
-  DefaultOrganizationBinding:
-    Account:
-      - !Ref AgoraDevAccount
-      - !Ref AgoraProdAccount
-    Region: us-east-1