Change relayer to wait for bundled runtime version(s) if it is started in bundled-version mode

[svyatonik]

Suggestion by @PierreBesson (thanks!): if relayer starts with a bundled-version mode (i.e. no --version-mode=Auto or something like that), let's wait until chain has the bundled version before actually starting relayer. That would allow us to e.g. keep running old relayer and at the same time deploy relayer for upcoming upgrade. So when upgrade happens, we won't need to deploy our relayer manually. I thought that we may do the same because of our relayer guard (so new relayer version will keep crashing until upgrade), but there's a backoff limit to restarts => it isn't good.

[svyatonik]

This is already implemented in #2894 and behavior will be the same in #2956 implementation.