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)

Backport #6971 into `stable2407` from alexggh.

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Backport #6973 into `stable2407` from alexggh.

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Backport #6807 into `stable2407` from alexggh.

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Backport #7116 into `stable2407` from alexggh.

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Backport #7013 into `stable2407` from bkchr.

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Backport #7050 into `stable2407` from skunert.

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Backport #6864 into `stable2407` from alexggh.

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Backport #6696 into `stable2407` from alexggh.

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Backport #5311 into `stable2407` from Doordashcon.

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Backport #6729 into `stable2407` from alexggh.

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Backport #6690 into `stable2407` from alexggh.

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Backport #6459 into `stable2407` from franciscoaguirre.

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Backport #6506 into `stable2407` from Dinonard.

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Backport #6540 into `stable2407` from Ank4n.

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Backport #6080 into `stable2407` from franciscoaguirre.

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Backport #6031 into `stable2407` from drewstone.

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This PR accompanies #6672 to make backported changes consistent across
releases.

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Backport #6603 into `stable2407` from lexnv.

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Backport #6645 into `stable2407` from bkontur.

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Backport #6526 into `stable2407` from bkchr.

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Backport #6417 into `stable2407` from alindima.

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Backport #6148 into `stable2407` from bkontur.

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Backport #6205 into `stable2407` from bkchr.

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Backport #5599 into `stable2407` from franciscoaguirre.

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Backport #4803 into `stable2407` from gotnoshoeson.

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Backport #5913 into `stable2407` from franciscoaguirre.

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Backport #3049 into `stable2407` from bgallois.

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Backport #5713 into `stable2407` from bkchr.

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Backport #5594 into `stable2407` from Moliholy.

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Backport #5695 into `stable2407` from ggwpez.

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Backport #5580 into `stable2407` from gui1117.

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Backport #5466 into `stable2407` (cc @ggwpez

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Backport #5644 into `stable2407` (cc @bkchr

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