Feat/11502 bpmn palette icons

[nkylstad]

Description

• Added icons for palette items using CSS
• Fixed height issue for BPMN editor

Updated stroke-width of icon svgs to 0.8 to match stroke in the process editor, FYI @Annikenkbrathen

Related Issue(s)

• Add icons for standard Altinn process tasks #11502

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a0e7fbe) 83.85% compared to head (7b8e4e2) 83.72%.

❗ Current head 7b8e4e2 differs from pull request most recent head 503ed02. Consider uploading reports for the commit 503ed02 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11654      +/-   ##
==========================================
- Coverage   83.85%   83.72%   -0.14%     
==========================================
  Files         883      885       +2     
  Lines       13023    13070      +47     
  Branches     1700     1712      +12     
==========================================
+ Hits        10921    10943      +22     
- Misses       1846     1868      +22     
- Partials      256      259       +3     

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