v1.2.7-rc1

What's Changed

• Feat/add new tool by @Cyber-SiKu in #2634
• [fix]error about status cluster no offline chunkserver by @caoxianfei1 in #2650
• [fix] Fixed delete file not returning status code error by @caoxianfei1 in #2672
• Feat/upgrade tools v2 1.2 by @Cyber-SiKu in #2699
• [tools] fix: get copyset status from chunkserver metric by @caoxianfei1 in #2738
• Ready for v1.2.7 rc1 by @wu-hanqing in #2776

Full Changelog: v1.2.7-beta2...v1.2.7-rc1