Fix locked deposits of Nicks pallet

[kianenigma]

The nicks pallet was removed at block 569325 from the runtime, without any consideration of the
fact that numerous accounts had reserved funds in this pallet. This migration is the outcome of
an investigation that tries to refund all of the accounts that had a nick set for them prior to
removal, if they still have the amount in their reserved balance. Otherwise, we ignore the
refund.

closes #3243

For the sake of posterity, the code that's used to generate this fix is here: https://gist.github.com/kianenigma/a34bcc2efcf753d986c199da62adffbd

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Release Note Addition

Please make sure this is added to the release note of 9150 runtime for transparency:

This runtime upgrade contains a custom migration that fixes the locked deposit participants of the historical Nicks pallet, which was only used temporarily in the Kusama runtime. See the list of affected accounts and more description here.

[michalisFr]

I have found a subset of @kianenigma's accounts, the ones that have a 10 KSM reserve and some that have 0.01 KSM (I wasn't looking for 0.01 KSM reserves, as I wasn't aware the reserved amount had changed). My results for the accounts with 10 KSM reserve agree with Kian's results, as do the accounts with 0.01 KSM that I found.

My approach can be found here:
#3243
but Kian's methodology is more solid.

The only account that potentially has a reserve from nicks but we couldn't determine it with certainty is this one:
CmD9vaMYoiKe7HiFnfkftwvhKbxN9bhyjcDrfFRGbifJEG8
and so it isn't included in this PR.

[shawntabrizi]

would like to have the account id written as a comment above these different hexs for easier audit

[kianenigma]

that's a good idea actually. I will add them, please manually check a few of them? they are all auto generated, so if one is correct, they all should be fine.

[kianenigma]

note that some accounts reserved 10KSM and some 10mKSM because of how the logic of the pallet changed, so variability here is expected.

[kianenigma]

bot merge