Update Dockerfile to use gcc-toolset-14 and fix test case failures on power (ppc64le)#28957

bhagyashrigai wants to merge 8 commits intovllm-project:mainvllm-project/vllm:mainfrom

odh-on-pz:vllm-power-fixodh-on-pz/vllm-upstream:vllm-power-fixCopy head branch name to clipboard