services with data directory should acquire a lock

[shivaraj-bh]

As an aside, perhaps all services-flake service should check for lockfile on its data directory and crash immediately if it was acquired.

Originally posted by @srid in https://github.com/juspay/services-flake/issues/309#issuecomment-2326767756

[srid]

I noticed a related issue: two services were trying to create ./data at the same time and failing. That should be somehow prevented as well.