Allow tool to mark PR ready for review

[rrgodhorus]

Describe the feature or problem you’d like to solve

Currently, the tool create_pull_request allows the PR to be created as draft (draft: true/false). But, it doesn't seem like there's a way to mark a PR as non-draft (Ready for Review).

Proposed solution

Add/modify a tool to allow marking a draft PR as ready for review.

How will it benefit GitHub MCP Server and its users?

A draft PR cannot be merged without first marking it as Ready. Hence, currently there's no way for an LLM to merge a draft PR, without someone manually marking it as ready

Additional context

N/A

[Vidit-Ostwal]

I think this is a good feature to have, to now allow LLM directly make a final PR. Human in the loop is a good feature to have, in my opinion.