Remove signing and ref-data-as-pdf from data types to sign

[mlqn]

Description

Remove signing data types from data types to sign

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• [x] Relevant automated test added (if you find this hard, leave it and we'll help out)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.70%. Comparing base (1071dbb) to head (d1c2a39).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #13048 +/- ## ======================================= Coverage 91.69% 91.70% ======================================= Files 1414 1414 Lines 19927 19935 +8 Branches 2396 2396 ======================================= + Hits 18273 18281 +8 Misses 1397 1397 Partials 257 257 ```

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