Retire dolphin runtime

[ghzlatarev]

Description

closes: #958

• Retire all Dolphin runtime related code, as it is not longer used for anything.
• check-tests was excluding pallet-manta-pay tests, when we only wanted to exclude the benchmark unit test (as our code relies on externally passed chain-spec file) . The fix is to not exclude in the CI but just hard-code disable the benchmark unit tests in the pallet code.
• gov v2 imports are required because of upstream code, so moved them outside of integrations test crate, as that crate is excluded in our unit tests job and it will fail compilation

---

Before we can approve this PR for merge, please make sure that all the following items have been checked off:

• Connected to an issue with discussion and accepted design using zenhub "Connect issue" button below
• Added one label out of the L- group to this PR
• Added one or more labels from the A- and C- groups to this PR
• Explicitly labelled A-calamari and/or A-manta if your changes are meant for/impact either of these (CI depends on it)
• Re-reviewed Files changed in the Github PR explorer.

Situational Notes:

• If adding functionality, write unit tests!
• If importing a new pallet, choose a proper module index for it, and allow it in BaseFilter. Ensure every extrinsic works from front-end. If there's corresponding tool, ensure both work for each other.
• If needed, update our Javascript/Typescript APIs. These APIs are officially used by exchanges or community developers.
• If modifying existing runtime storage items, make sure to implement storage migrations for the runtime and test them with try-runtime. This includes migrations inherited from upstream changes, and you can search the diffs for modifications of #[pallet::storage] items to check for any.

[ghzlatarev]

cargo clippy seems to be broken with any rust version

[Dengjianping]

And we might delete dolphin docs from our manta docs

[Dengjianping]

And some dolphin genesis files should be deleted

[github-actions]

⚠️ Congestion test: 1-day congestion cost (calamari) is NOT above target_daily_congestion_cost_kma

[github-actions]

⚠️ Congestion test: 1-day congestion cost (calamari-runtime) is NOT above target_daily_congestion_cost_kma

[github-actions]

⚠️ Congestion test: 1-day congestion cost (manta-runtime) is NOT above target_daily_congestion_cost_kma

[ferrell-code]

looks good ci still seems to be failing

[ghzlatarev]

looks good ci still seems to be failing

Yeah i see why.
Something from upstream pulls the gov v2 pallets, which require us to also include them.
But if we include them in the integrations-test crate (and exclude it in the unit tests) then it won't compile.

This actually showed that we had broken our unit tests in another way. We wanted to exclude the manta-pay benchmarking unit test, but we had excluded all the unit tests. Fixed this now.

[Dengjianping]

I thought we would have faster ci check once dolphin runtime.
By the way, not sure it will affect change log generation, the dolphin tag [DO]. I suppose it won't.

[ghzlatarev]

I thought we would have faster ci check once dolphin runtime. By the way, not sure it will affect change log generation, the dolphin tag [DO]. I suppose it won't.

no, we stopped Dolphin jobs some time ago already. This is just to reduce code base -8000 lines feels good

also re-includes mantapay in the unit tests job as they were not running for a few days