Replace `wget` with `curl`

[ybyzek]

Description
Replace wget with curl because sometimes wget is an extra install and not available in users environments. curl is more readily available. This causes friction for users on new machines.

ccloud/docs/ccloud-stack.rst:      wget -O ccloud_library.sh https://raw.githubusercontent.com/confluentinc/examples/latest/utils/ccloud_library.sh
clients/docs/rest-proxy.rst:- ``wget``
clients/docs/rest-proxy.rst:      wget -O docker-compose.yml https://raw.githubusercontent.com/confluentinc/cp-all-in-one/|release_post_branch|/cp-all-in-one-cloud/docker-compose.yml
clients/cloud/rest-proxy/start-ccsr.sh:wget -O docker-compose.yml https://raw.githubusercontent.com/confluentinc/cp-all-in-one/${CONFLUENT_RELEASE_TAG_OR_BRANCH}/cp-all-in-one-cloud/docker-compose.yml
clients/cloud/rest-proxy/start.sh:wget -O docker-compose.yml https://raw.githubusercontent.com/confluentinc/cp-all-in-one/${CONFLUENT_RELEASE_TAG_OR_BRANCH}/cp-all-in-one-cloud/docker-compose.yml
cp-quickstart/start-docker.sh:wget -O docker-compose.yml https://raw.githubusercontent.com/confluentinc/cp-all-in-one/${CONFLUENT_RELEASE_TAG_OR_BRANCH}/cp-all-in-one/docker-compose.yml
cp-quickstart/start-docker-kraft.sh:wget -O docker-compose.yml https://raw.githubusercontent.com/confluentinc/cp-all-in-one/${CONFLUENT_RELEASE_TAG_OR_BRANCH}/cp-all-in-one-kraft/docker-compose.yml
cp-quickstart/start-docker-kraft.sh:wget -O update_run.sh https://raw.githubusercontent.com/confluentinc/cp-all-in-one/${CONFLUENT_RELEASE_TAG_OR_BRANCH}/cp-all-in-one-kraft/update_run.sh
cp-quickstart/start-docker-community.sh:wget -O docker-compose.yml https://raw.githubusercontent.com/confluentinc/cp-all-in-one/${CONFLUENT_RELEASE_TAG_OR_BRANCH}/cp-all-in-one-community/docker-compose.yml
cp-quickstart/start-docker-community.sh:wget -O connector_pageviews_cos.config  https://github.com/confluentinc/kafka-connect-datagen/raw/master/config/connector_pageviews_cos.config
cp-quickstart/start-docker-community.sh:wget -O connector_users_cos.config https://github.com/confluentinc/kafka-connect-datagen/raw/master/config/connector_users_cos.config
"$wrapperJarPath"
multiregion/Dockerfile:RUN wget http://vault.centos.org/8.1.1911/BaseOS/x86_64/os/Packages/iproute-tc-4.18.0-15.el8.x86_64.rpm
multiregion/Dockerfile:RUN wget http://vault.centos.org/8.1.1911/BaseOS/x86_64/os/Packages/iptables-libs-1.8.2-16.el8.x86_64.rpm
utils/ccloud_library.sh:#   wget -O ccloud_library.sh https://raw.githubusercontent.com/confluentinc/examples/latest/utils/ccloud_library.sh