Improve version control for third-party integrations' dashboards

[AlexRuiz7]

Description

Currently, some of the third-party integrations Docker Compose projects use hard-coded values for the services versions. To ease their maintenance, these versions must be controlled via the .env file.

On the other hand, we need to implement a version control strategy for the integrations. We will use the latest version possible for each of the services (OpenSearch, Splunk, Elastic, ...). As it's possible that the courtesy dashboards break on recent versions, we need to keep a compatibility matrix for them, describing the version of the dashboard and the supported product versions.

Tasks

• Centralize services versioning.
• Upgrade services to the latest version available and check that the integrations work.