Updating tool get_pull_request_comments -> get_pull_request_review_comments

[tonytrg]

There have been rightly so confusions about this tool by LLM and human interpretation.

This change in the tools naming and description signifies the difference between:

• issue comments
• pr review comments

We are sticking closer the the official documentation

Closes: #735

[Copilot]

Pull Request Overview

This PR renames the tool get_pull_request_comments to get_pull_request_review_comments to better clarify its purpose. The change addresses confusion between issue comments and pull request review comments by making the tool name and description more specific.

• Renamed the tool function from GetPullRequestComments to GetPullRequestReviewComments
• Updated tool name from get_pull_request_comments to get_pull_request_review_comments
• Enhanced description to clarify that these are review comments on code diffs, not general issue comments

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/github/tools.go	Updated tool registration to use the new function name
pkg/github/pullrequests_test.go	Updated test function calls and assertions to match the new tool name
pkg/github/pullrequests.go	Renamed function and updated tool definition with clearer description
pkg/github/toolsnaps/get_pull_request_review_comments.snap	Added snapshot file for the renamed tool
README.md	Updated documentation to reflect the new tool name and description

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