Fix typos in common/config.go

Mridankan Mandalrequested to merge
gitlab-community/gitlab-org/gitlab-runner:fix/common-config-typos into main

What does this MR do?

Fixes typos in common/config.go.

  • snapshoting -> snapshotting
  • suppor toml -> support TOML
  • coniguration -> configuration

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