[improvement] logtail: optimize the instance allocation. #26748

Job	Run time
CHECK PR VALID	4s
Matrixone Compose CI / multi cn e2e bvt test docker compose(PESSIMISTIC)	31m 26s
Matrixone Standlone CI / e2e BVT Test on Linux/x64(LAUNCH,Optimistic)	34m 53s
Matrixone Compose CI / multi cn e2e bvt test docker compose(Optimistic/PUSH)	23m 3s
Matrixone Standlone CI / Multi-CN e2e BVT Test on Linux/x64(LAUNCH, PROXY)	28m 40s
Matrixone Standlone CI / e2e BVT Test on Linux/x64(LAUNCH, PESSIMISTIC)	26m 11s
Matrixone CI / SCA Test on Ubuntu/x86	10m 24s
Matrixone CI / UT Test on Ubuntu/x86	19m 1s
Matrixone CI / UT Test on Darwin/x86	0s
Matrixone Upgrade CI / Compatibility Test With Release on Linux/x64(LAUNCH)	50m 59s
Matrixone Upgrade CI / Compatibility Test With Target on Linux/x64(LAUNCH)	52m 15s
Matrixone Utils CI / check_organization_user	1s
Matrixone Utils CI / pr-size-label	2s
Matrixone Utils CI / Coverage	58m 30s
Matrixone Utils CI / docu_issue_check	3s
	5h 35m 32s

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