DOCS-2215 Add @env variables to datadog.yaml

[ruthnaebeck]

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What does this PR do?

Add @env variables to datadog.yaml:

DD_AUTOCONF_TEMPLATE_DIR
DD_AUTOCONFIG_EXCLUDE_FEATURES
DD_AUTOCONFIG_INCLUDE_FEATURES
DD_CLOUD_FOUNDRY_BBS_ENV_EXCLUDE
DD_CLOUD_FOUNDRY_BBS_ENV_INCLUDE
DD_CLOUD_FOUNDRY_CC_URL
DD_CLOUD_FOUNDRY_CC_CLIENT_ID
DD_CLOUD_FOUNDRY_CC_CLIENT_SECRET
DD_CLOUD_FOUNDRY_CC_SKIP_SSL_VALIDATION
DD_CLOUD_FOUNDRY_CC_POLL_INTERVAL
DD_CLOUD_FOUNDRY_CC_APPS_BATCH_SIZE
DD_CLOUD_FOUNDRY_GARDEN_LISTEN_ADDRESS
DD_CLOUD_FOUNDRY_GARDEN_LISTEN_NETWORK
DD_DISABLE_CLUSTER_NAME_TAG_KEY
DD_ECS_METADATA_TIMEOUT
DD_ECS_RESOURCE_TAGS_REPLACE_COLON
DD_KUBERNETES_APISERVER_CA_PATH
DD_KUBERNETES_APISERVER_TLS_VERIFY
DD_KUBERNETES_NAMESPACE_LABELS_AS_TAGS
DD_SNMP_TRAPS_CONFIG_PORT
DD_SNMP_TRAPS_CONFIG_COMMUNITY_STRINGS
DD_SNMP_TRAPS_CONFIG_BIND_HOST
DD_SNMP_TRAPS_CONFIG_STOP_TIMEOUT
DD_SNMP_TRAPS_ENABLED

Motivation

• Documentation OKR
• RFC

Additional Notes

Variables will be added in small batches.

Describe how to test your changes

N/A

Reviewer's Checklist

• [x] If known, an appropriate milestone has been selected; otherwise the Triage milestone is set.
• [x] The appropriate team/.. label has been applied, if known.
• [x] A release note has been added or the changelog/no-changelog label has been applied.
• [ ] Changed code has automated tests for its functionality.
• [ ] Adequate QA/testing plan information is provided if the qa/skip-qa label is not applied.
• [x] If applicable, docs team has been notified or an issue has been opened on the documentation repo.
• [ ] If applicable, the need-change/operator and need-change/helm labels have been applied.
• [x] If applicable, the config template has been updated.

[ruthnaebeck]

Holding for code freeze

[sgnn7]

@ruthnaebeck This PR will need rebasing before merge. Since it's freeze day for 7.38, should we move the milestone on this to 7.39?

[hestonhoffman]

Hi! Since so much time has elapsed since this PR was opened, I'm going to close it and do a little investigation to see if these changes are still necessary. I have a ticket for this work here. I'll open a fresh PR once I've taken a look.

[bits-bot]

All committers have signed the CLA.

[hestonhoffman]

After getting some more context on this one, I decided to reopen and fix the merge conflict so we don't have to ask everyone for reviews again