Fix/ some bugs in attachmentList

[lassopicasso]

Description

This PR fixes two bugs that I encountered after merging the following PR: #12067

• Remove not supporting data type ids message

• hide PDF selector in attachmentList when layout set does not have the task customReceipt
  PDF selector can only be generated in the app in this task.

Related Issue(s)

• itself

Verification

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

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.17%. Comparing base (378e7e3) to head (c2cb9d6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12680   +/-   ##
=======================================
  Coverage   90.16%   90.17%           
=======================================
  Files        1296     1296           
  Lines       18553    18557    +4     
  Branches     2259     2261    +2     
=======================================
+ Hits        16729    16733    +4     
  Misses       1564     1564           
  Partials      260      260           

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[mlqn]

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