Fix Create Environment workflow issues

[gurevichdmitry]

Summary of your changes

This PR fixes issues related to the Create Environment workflow:

• The DeploymentFailed error with the code RoleAssignmentUpdateNotPermitted occurs when attempting to update a role assignment that is not allowed. Since we regularly create and delete roles, sometimes we use the same deployment name, which prevents creation or updates. To fix this, I added deployment_name randomization.
• Fixed an issue in Terraform that prevented separate modules from being installed.

Screenshot/Data

Related Issues

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary README/documentation (if appropriate)

Introducing a new rule?

• Generate rule metadata using this script
• Add relevant unit tests
• Generate relevant rule templates using this script, and open a PR in elastic/packages/cloud_security_posture

[mergify]

This pull request does not have a backport label. Could you fix it @gurevichdmitry? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit
  NOTE: backport-v8.x has been added to help with the transition to the new branch 8.x.

[kubasobon]

🚀 LGTM