manage C#-only experiments with `ExperimentsManager` #27112

Job	Run time
ci (bundler, bundler, bundler)	12s
ci (cargo, cargo, cargo)	14s
integration	4m 1s
ci (common, common, common)	1m 4s
ci (composer, composer, composer)	13s
ci (docker, docker, docker)	13s
Lint	1m 7s
ci (dotnet_sdk, dotnet_sdk, dotnet-sdk)	13s
ci (elm, elm, elm)	11s
ci (git_submodules, git_submodules, gitsubmodule)	12s
Updater	2m 58s
ci (github_actions, github_actions, github-actions)	11s
ci (go_modules, go_module, gomod)	11s
ci (gradle, gradle, gradle)	12s
ci (hex, hex, mix)	12s
ci (maven, maven, maven)	13s
ci (npm_and_yarn, npm_and_yarn, npm)	10s
ci (nuget, nuget, nuget)	2m 0s
ci (pub, pub, pub)	11s
ci (python, python, pip)	12s
ci (python, python_slow, pip)	12s
ci (swift, swift, swift)	12s
ci (devcontainers, devcontainers, devcontainers)	11s
ci (terraform, terraform, terraform)	11s
	14m 56s

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