Fix bug with whitespace consisting broken path

[suneeta-mall]

Description

What behavior does this PR change, and why?
The cloud stack destroy script fails if path consists of whitespace:

./ccloud_stack_destroy.sh stack-configs/java-service-account-164390.config                     
./ccloud_stack_destroy.sh: line 6: <> No such file or directory
./ccloud_stack_destroy.sh: line 7: <>: No such file or directory
./ccloud_stack_destroy.sh: line 9: ccloud::validate_version_ccloud_cli: command not found

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[ybyzek]

@suneeta-mall thanks for the PR.

1. Are both the double quotes and curly braces required, or would just double quotes be sufficient?
2. This methodology is used in other places in this repo. We should consider whether this PR should address all instances:

ccloud/ccloud-stack/ccloud_stack_destroy.sh:source $DIR/../../utils/helper.sh
ccloud/ccloud-stack/ccloud_stack_destroy.sh:source $DIR/../../utils/ccloud_library.sh
ccloud/create_ksqldb_app.sh:source $DELTA_CONFIGS_DIR/env.delta
ccloud/start-docker.sh:source $DELTA_CONFIGS_DIR/env.delta
ccloud/start.sh:source $DELTA_CONFIGS_DIR/env.delta
clients/cloud/java-springboot/startStreams.sh:source $DELTA_CONFIGS_DIR/env.delta
clients/cloud/java-springboot/startProducerConsumer.sh:source $DELTA_CONFIGS_DIR/env.delta
cloud-etl/create_ksqldb_app.sh:source $DELTA_CONFIGS_DIR/env.delta
cloud-etl/read-data.sh:source $DELTA_CONFIGS_DIR/env.delta
cloud-etl/start.sh:source $DELTA_CONFIGS_DIR/env.delta
microservices-orders/start-ccloud.sh:source $DELTA_CONFIGS_DIR/env.delta
multiregion/scripts/start.sh:source ${DIR}/../.env
utils/helper.sh:source "${DIR_HELPER}/config.env"

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