fix: Change default config.properties to instantiate a coordinator

[infvg]

This PR accidentally changed the default config.properties: https://github.com/prestodb/presto/pull/26635/changes
This changes it back.

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Update the default Presto config.properties to start a single-node coordinator instead of a resource manager-based deployment by toggling coordinator-related properties and removing resource-manager-specific settings.

File-Level Changes

Change	Details	Files
Switch default server role from resource manager to coordinator in the example config	Set the node to run as a coordinator by changing the coordinator property from false to true Remove the resource-manager flag from the default configuration Remove resource-manager-enabled and related internal communication protocol properties, assuming a simpler, coordinator-only setup Keep discovery and scheduler settings aligned with a single-node coordinator configuration	presto-main/etc/config.properties

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[sourcery-ai]

Hey - I've left some high level feedback:

• Given the switch from a resource manager to a coordinator, consider updating node.id (currently ending with rm) to avoid confusing users about the node’s intended role.
• You might want to keep the removed resource-manager-related properties in the sample config as commented-out examples so users can more easily configure a resource manager if needed.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Given the switch from a resource manager to a coordinator, consider updating `node.id` (currently ending with `rm`) to avoid confusing users about the node’s intended role.
- You might want to keep the removed resource-manager-related properties in the sample config as commented-out examples so users can more easily configure a resource manager if needed.

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[nishithakbhaskaran]

Thanks for the fix @infvg .