fix: add summary2 property to custom config exclusion list

[Jondyr]

Description

Removes the info message that this config property is under development, as we have a custom config for this property.

Before:

After:

Related Issue(s)

• #{issue number}

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)

[lassopicasso]

nice fix

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.46%. Comparing base (72c563a) to head (9e94d15).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14207   +/-   ##
=======================================
  Coverage   95.46%   95.46%           
=======================================
  Files        1803     1803           
  Lines       23488    23488           
  Branches     2719     2719           
=======================================
  Hits        22422    22422           
  Misses        812      812           
  Partials      254      254           

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[JamalAlabdullah]

Tested ok in dev 👍