NAS-130388 / 24.10 / Remove some usages of flex-layout

[undsoft]

Testing:

Test some of the affected places for regressions.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-130388

[codecov[bot]]

Codecov Report

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

Project coverage is 77.17%. Comparing base (99130f8) to head (6336b65). Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10393      +/-   ##
==========================================
+ Coverage   77.10%   77.17%   +0.06%     
==========================================
  Files        1597     1609      +12     
  Lines       54871    55015     +144     
  Branches     6474     6481       +7     
==========================================
+ Hits        42311    42457     +146     
+ Misses      12560    12558       -2     

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[bugclerk]

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