DEVX-2463-cont: replace -f removal of files

[awalther28]

Description

What behavior does this PR change, and why?

In #920 @rspurgeon suggested

IMO we do not need -f here. I tested this command without, and considering the user previously created the file in a folder that they have proper permissions on, the -f isn't required. So introducing the force option seems like an unecessary risk, in case something important (oddly) happen to get into the KSQLDB_SERVER_DELTA variable.

If we want to silence error messages if the file doesn't exist, i suggeste we use rm $KSQLDB_SERVER_DELTA 2>/dev/null

To be cautious we should refrain from force removing files in our demos when we don't have to. This PR changes for rm -f to rm $KSQLDB_SERVER_DELTA 2>/dev/null. I validated this by running ccloud-stack-create (generating configs with both bash and zsh) and running the microservices demo.

Author Validation

Describe the validation already done, or needs to be done, by the PR submitter.

• ccloud

Reviewer Tasks

Describe the tasks/validation that the PR submitter is requesting to be done by the reviewer.

• ccloud
• other cloud demos that use ccloud-stack-create

[rspurgeon]

LGTM, thanks!