This PR modifies `named_reserve()` in frame-balances to use checked math
instead of defensive saturating math.

The use of saturating math relies on the assumption that the sum of the
values will always fit in `u128::MAX`. However, there is nothing
preventing the implementing pallet from passing a larger value which
overflows. This can happen if the implementing pallet does not validate
user input and instead relies on `named_reserve()` to return an error
(this saves an additional read)

This is not a security concern, as the method will subsequently return
an error thanks to `<Self as ReservableCurrency<_>>::reserve(who,
value)?;`. However, the `defensive_saturating_add` will panic in
`--all-features`, creating false positive crashes in fuzzing operations.

---------

Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
(cherry picked from commit f373af0d)

This PR contains a fix for the rc-build release pipeline. The problem
was, that for the deb package build were all the artefacts downloaded
and merged together, what could lead to the issue, that the polkadot
linux binary was overwritten with the macos one.

Backport #7344 into `stable2412` from dmitry-markin.

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Co-authored-by: Dmitry Markin <dmitry@markin.tech>

Backport #7322 into `stable2412` from bkontur.

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Co-authored-by: Branislav Kontur <bkontur@gmail.com>

This is a partial backport of #6825 and #7205. Only the node-side minor
changes were ported. However, this creates forward compatibility of the
omni-node from 2412 with runtimes built after #6825.

Backport #7222 into `stable2412` from lexnv.

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---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>
Co-authored-by: Alexandru Vasile <alexandru.vasile@parity.io>

Backport #7099 into `stable2412` from lexnv.

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---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>
Co-authored-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: Egor_P <egor@parity.io>

Fix the CI issue on the stable2412 branch by deleting the
`bandersnatch-experimental` dependant code. Also fix some other CI
checks.

The Bandersnatch VRFs crate is not on crates-io, hence why it is not
included in the release
https://github.com/paritytech/polkadot-sdk/blob/a843d15e

/substrate/primitives/core/Cargo.toml#L73

The only upstream crate that depends on this is
`sp-consensus-sassafras`, but we dont release that. So hopefully CI goes
green.

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Backport #7158 into `stable2412` from lexnv.

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Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

Backport #6971 into `stable2412` from alexggh.

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Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>

Backport #6973 into `stable2412` from alexggh.

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Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>

Backport #6807 into `stable2412` from alexggh.

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Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>

Backport #6604 into `stable2412` from bkchr.

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---------

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Bastian Köcher <info@kchr.de>

Backport #7133 into `stable2412` from lexnv.

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Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

Backport #5526 into `stable2412` from ordian.

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Co-authored-by: ordian <write@reusable.software>

Backport #6855 into `stable2412` from alistair-singh.

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---------

Co-authored-by: Alistair Singh <alistair.singh7@gmail.com>
Co-authored-by: Adrian Catangiu <adrian@parity.io>

Backport #7050 into `stable2412` from skunert.

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Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

Backport #7011 into `stable2412` from dmitry-markin.

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---------

Co-authored-by: Dmitry Markin <dmitry@markin.tech>

Backport #7013 into `stable2412` from bkchr.

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Co-authored-by: Bastian Köcher <git@kchr.de>

Backport #7028 into `stable2412` from gui1117.

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---------

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

Found by @ggwpez



Fix staking benchmark, error was introduced when migrating to v2:
https://github.com/paritytech/polkadot-sdk/pull/6025

Also disable flaky tests similar to
https://github.com/paritytech/polkadot-sdk/pull/6749:
* zombienet-polkadot-functional-0017-sync-backing 
*
zombienet-polkadot-elastic-scaling-0002-elastic-scaling-doesnt-break-parachains

---------

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Backport #7116 into `stable2412` from alexggh.

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Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>