Refactor log viewer, remove follow logs option and fix autorefresh

[floreks]

Fixes #5854

• Complete refactoring of log viewer styling. Flex instead of absolute positioning.
• Auto-adjust height/width of log viewer to the window size up to the min. values. It was a bit buggy previously.
• Used theming framework to properly define colors inside the log viewer
• Removed the Follow logs option as it was not clear what it was actually doing. Instead, when autorefresh is applied and the user scrolls to the bottom of the log viewer it will automatically scroll to the latest part on refresh.
• Slightly changed timestamp formatting
• Fixed auto-refresh option and refactored component a bit

New timestamp

Old timestamp

[codecov]

Codecov Report

Merging #5868 (653433c) into master (d944f37) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5868   +/-   ##
=======================================
  Coverage   44.40%   44.40%           
=======================================
  Files         215      215           
  Lines        9175     9175           
  Branches      113      113           
=======================================
  Hits         4074     4074           
  Misses       4827     4827           
  Partials      274      274           

[maciaszczykm]

/lgtm

[maciaszczykm]

/lgtm

[k8s-ci-robot]

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