commitlint: footer-refs-validity bug

[knocte]

False positive:

Backend(,Tests): don't marshall hybrid type names

This is the 1st part (out of three) to fix bug 242: in certain
circumstances, the call to Type.GetType(fullTypeName) was
returning null (and then causing an NRE like the stacktrace in
bug 242 proves) or a FileLoadException [3].

It turns out that .NET's BCL, despite having separate
properties for the Type names "FullName" vs
"AssemblyQualifiedName", the first one still adds assembly
qualified names to types that are part of a generic type
definition. I.e., it will not add them in a type such as
"System.String" but it will in one such as "List<String>"
(see [1]):

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"System.Collections.Generic.List`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c5619[34](https://github.com/nblockchain/geewallet/actions/runs/7526526463/job/20485327146#step:7:35)e089]]
` ` `

This could be dangerous because it would embed the version
number (even though we already have a JSON field for that in
our MarshallingWrapper type, which could make the type be not
found by Type.GetType (and as a consequence return null, or
throw the exception mentioned before).

The fix, or rather workaround, here, is to use ToString()
instead of the .FullName property, as hinted by this S.O.
answer: [2].

[1] https://learn.microsoft.com/en-us/dotnet/api/system.type.fullname
[2] https://stackoverflow.com/a/4662878/23158491
[3] Stack trace:
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System.IO.FileLoadException: Could not load file or assembly 'GWallet.Backend, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. The located assembly's manifest definition does not match the assembly reference. (0x80131040)
File name: 'GWallet.Backend, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
   at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, StackCrawlMarkHandle stackMark, ObjectHandleOnStack assemblyLoadContext, ObjectHandleOnStack type, ObjectHandleOnStack keepalive)
   at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, StackCrawlMark& stackMark, AssemblyLoadContext assemblyLoadContext)
   at System.RuntimeType.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, StackCrawlMark& stackMark)
   at System.Type.GetType(String typeName)
   at GWallet.Backend.Marshalling.ExtractType(String json) in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Backend/Marshalling.fs:line 156
   at GWallet.Backend.Account.ImportSignedTransactionFromJson(String jsonOrCompressedJson) in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Backend/Account.fs:line 713
   at GWallet.Backend.Account.LoadSignedTransactionFromFile(String filePath) in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Backend/Account.fs:line 766
   at Program.BroadcastPayment() in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Frontend.Console/Program.fs:line 62
   at Program.PerformOperation(UInt32 numActiveAccounts, UInt32 numHotAccounts) in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Frontend.Console/Program.fs:line [39](https://github.com/nblockchain/geewallet/actions/runs/7526526463/job/20485327146#step:7:40)8
   at Program.ProgramMainLoop[a]() in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Frontend.Console/Program.fs:line [47](https://github.com/nblockchain/geewallet/actions/runs/7526526463/job/20485327146#step:7:48)8
   at Program.NormalStartWithNoParameters() in /Users/knocte/Documents/Code/geewalletSTABLE/src/GWallet.Frontend.Console/Program.fs:line [49](https://github.com/nblockchain/geewallet/actions/runs/7526526463/job/20485327146#step:7:50)0
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