chore: Fix stream-connection tests

[manupedrozo]

Fixing stream-connection tests

• Remove mdbVersion flag from cluster creation in the stream-connection test setup which is causing "ATLAS_CLUSTER_VERSION_DEPRECATED" errors (example).

• Change the DbRoleToExecute.Role in the update input to a valid one (readWrite -> readWriteAnyDatabase).

• After the test: delete the stream instance before deleting the project to avoid "CANNOT_CLOSE_GROUP_ACTIVE_STREAMS_RESOURCE" errors (example).

Link to any related issue(s):

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update
• If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Manual QA performed:

• cfn invoke for each of CRUDL/cfn test
• Updated resource in example
• Published to AWS private registry
• Used the template in example to create and update a stack in AWS
• Deleted stack to ensure resources are deleted
• Created multiple resources in same stack
• Validated in Atlas UI
• Included screenshots

Required Checklist:

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• For CFN Resources: I have released by changes in the private registry and proved by change
  works in Atlas

Further comments

[maastha]

can you also check if any other scripts have this?

[manupedrozo]

A couple more have mdbVersion but none with 6.0. Should look into removing those as well.