Add flag to optionally disable adding Thanos params when querying metrics

[anas-aso]

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

Currently Thanos Ruler doesn't work with services exposing Prometheus query or query_range API that strictly validate received request parameters (e.g GCP Managed Prometheus frontend component - GMP Frontend).
Example error when pointing Thanos Ruler to a GMP Frontend setup URL

{
  "error": {
    "code": 400,
    "message": "Invalid JSON payload received. Unknown name \"dedup\": Cannot bind query parameter. Field 'dedup' could not be found in request message.
Invalid JSON payload received. Unknown name \"partial_response\": Cannot bind query parameter. Field 'partial_response' could not be found in request message.",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "description": "Invalid JSON payload received. Unknown name \"dedup\": Cannot bind query parameter. Field 'dedup' could not be found in request message."
          },
          {
            "description": "Invalid JSON payload received. Unknown name \"partial_response\": Cannot bind query parameter. Field 'partial_response' could not be found in request message."
          }
        ]
      }
    ]
  }
}

This change proposes to add an optional flag to disable sending Thanos specific parameters.

Verification

The change works with GMP Frontend.

Here is a custom docker image to try: https://hub.docker.com/r/anasaso/thanos

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[bwplotka]

Nice, just let's make this flag hidden so we can experiment with it a little bit (niche use case).

Also proposed better help, otherwise LGTM (:

[bwplotka]

Thanks!