Use otelcol-contrib package for traces instead of docker

[manav2401]

Description

Currently, we used docker image of open collector to parse and send traces to datadog. On our internal nodes, using docker is not advisable (suggestion from devops) and hence we're planning to use the package with a service file. In order to have the same setup on devnets as well, this PR makes changes for the same. Moreover, the config file has been simplified to only have traces and nothing else. As we'll move to coralogix soon, we will have a common config which will handle all the metrics and traces so for now (while we have datadog), we can have a minimalistic config

NOTE: Do not merge - trying to clarify few things from devops.

Changes

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• New test case for remote devnet

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply

Testing

• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai

[manav2401]

Closing this as datadog can send traces directly in a single config.