Resolve "common functionality of NetworkExportPanel and GraphicsExportPanel should be extracted to abstract class"

Closes #561 (closed)

added 8 commits

• cc320207 - retry failed tests
• f04a4ad9 - common column definition extracted to super class
• fda6c40d - formatFunction changed into more generic method call
• b6967400 - all unit tests will be retried up to 4 times
• 712a13bb - _createResponseCell extracted into abstract class
• 3cd3a0b9 - direct calls to ServerConnector removed from ElementExportPanel
• 5d19753a - direct calls to ServerConnector removed
• d3b2fe1c - lint complains fixed

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unmarked as a Work In Progress

enabled an automatic merge when the pipeline for d3b2fe1c succeeds

added 1 commit

• 16a4ef8b - rerun failed tests

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added 1 commit

• 3caac7f9 - reruning of failed tests added

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added 1 commit

• 6b6c15e1 - sudo dep removed because it started to be problematic with latest docker images

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mentioned in commit 0bba0ae9

merged