entityanalytics_ad: Allow rerouting permissions to write data to other data streams.

[kcreddy]

Proposed commit message

Make "data_stream.elasticsearch.dynamic_dataset" and 
"data_stream.elasticsearch.dynamic_namespace" settings to "true".
Without these settings, the permissions are not properly added to write 
data to "user" and "device" data streams and causes the error:

{\"type\":\"security_exception\",\"reason\":\"action [indices:data/write/bulk[s]] is unauthorized for API key id [REDACTED] of user [elastic/fleet-server] on indices [logs-entityanalytics_ad.user-default], this action is granted by the index privileges [create_doc,create,delete,index,write,all]\"}

Other "entityanalytics_*" integrations already have these settings.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 60d3f22

cc @kcreddy

[chemamartinez]

LGTM

[elastic-vault-github-plugin-prod]

Package entityanalytics_ad - 0.17.1 containing this change is available at https://epr.elastic.co/package/entityanalytics_ad/0.17.1/