MsgPack003 flags reference to class with ? nullable annotation, despite appearing in MessagePackAnalyzer.json

[AArnott]

Bug description

The MsgPack003 analyzers should ignore the ? annotation from nullable reference types before looking for a matching type name in MessagePackAnalyzer.json.

Repro steps

	[Key(9)]
	public ZcashAddress? OtherPartyAddress { get; init; }

And a MessagePackAnalyzer.json file with this content:

[
	"Nerdbank.Zcash.ZcashAddress"
]

Expected behavior

No error

Actual behavior

Error MsgPack003 Type must be marked with MessagePackObjectAttribute. ZcashTransaction.OtherPartyAddress.

What happened instead of what you expected.

• Version used: 2.5.129

Workaround

Remove the ? annotation, and attribute the member with [MaybeNull] instead.