Shorter availability data retention period for testnets

[s0me0ne-unkn0wn]

Closes #3270

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[s0me0ne-unkn0wn]

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@s0me0ne-unkn0wn Command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh" has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/8101868 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/8101868/artifacts/download.

[s0me0ne-unkn0wn]

Okay, let's start with this. Consider this a draft, as I'm not quite sure in some points.

[sandreim]

Are we sure this will have the desired effect ?

polkadot-sdk/polkadot/node/service/src/chain_spec.rs

Line 155 in 80e30ec

.with_chain_type(ChainType::Live)

What is the chain_type() for

polkadot-sdk/polkadot/node/service/src/chain_spec.rs

Line 86 in 80e30ec

WestendChainSpec::from_json_bytes(&include_bytes!("../chain-specs/westend.json")[..])

?

[s0me0ne-unkn0wn]

Fixed it. Now the question is, do we want 1 hour default period for all the non-production networks (that is, including Westend and stuff)? Or do we want to have 25 by default and only make it possible to lower it explicitly with the cli flag?