chore: tweak the prompt of the pull request

[xingwanying]

精简优化了一下cr的prompt

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Name	Status	Preview	Comments	Updated (UTC)
petercat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 14, 2024 6:42am

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概述

此PR对代码审查的提示进行了精简和优化，增强了对关键问题的关注，明确了工具的使用说明，并调整了一些措辞以提高准确性和清晰度。

变更

文件	概要
server/agent/prompts/pull_request.py	优化了角色描述和技能说明，明确了工具的使用方法，调整了任务和约束的描述以提高准确性。

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
server/agent/prompts/pull_request.py	66.66% <100.00%> (ø)

... and 6 files with indirect coverage changes