OpenTelemetry Collector: Add tests and support version latest

[pieterlexis-tomtom]

This PR adds several features to the OpenTelemetry Collector role.

The first thing is support for otel_collector_version: latest, that will automatically determine the latest version and install it.
The second feature is that the role will no longer download or replace the binary if the otel_collector_version is already installed, this also solves some idempotency issues with the role

To finish off, As there weren't any, I've added several Molecule scenarios and tests for this role.

• feat(otelcol): Support version: latest
• ci(otelcol): Add molecule tests

[pieterlexis-tomtom]

The CI failures in 'sanity' and integration seem to be unrelated to my changes. The 'Latest' check fails because of an issue with the upstream repository. The latest release is determined as

ok: [almalinux-9] => {"ansible_facts": {"otel_collector_version": "0.115.1"}, "attempts": 1, "changed": false}

And that one is downloaded + installed:

changed: [almalinux-9] => {"changed": true, "checksum_dest": null, "checksum_src": "cf68b9a1bc217c1b507e4b13688bff2fdbd4225e", "dest": "/tmp/otelcol-contrib-0.115.1.tar.gz", "elapsed": 36, "gid": 0, "group": "root", "md5sum": "642220d90faf3af914806bf1014b0c75", "mode": "0755", "msg": "OK (73825543 bytes)", "owner": "root", "size": 73825543, "src": "/root/.ansible/tmp/ansible-tmp-1733406149.7028937-1716695-196129702525888/tmptheug6qa", "state": "file", "status_code": 200, "uid": 0, "url": "https://github.com/open-telemetry/opentelemetry-collector-releases/releases/download/v0.115.1/otelcol-contrib_0.115.1_linux_amd64.tar.gz"}

However, the binary itself identifies itself as 0.115.0:

ok: [almalinux-9] => {"changed": false, "cmd": ["/etc/otel-collector/otelcol-contrib", "-v"], "delta": "0:00:00.091767", "end": "2024-12-05 13:43:34.802920", "failed_when_result": false, "msg": "", "rc": 0, "start": "2024-12-05 13:43:34.711153", "stderr": "", "stderr_lines": [], "stdout": "otelcol-contrib version 0.115.0", "stdout_lines": ["otelcol-contrib version 0.115.0"]}

See this issue.