SEAB-5445: Tint notebook stream error output

[svonworl]

Description
This PR changes the background color of the error ("stderr") stream output in the notebook preview to a pleasant light-orangeish red, so that it can be differentiated from the normal ("stdout") stream output.

Review Instructions
Register a notebook on qa that has stderr stream output (or use the "running" notebook if it is already registered), view its Preview tab, and confirm that the background of the stderr output is reddish.

Issue
https://ucsc-cgl.atlassian.net/browse/SEAB-5445

Security
If there are any concerns that require extra attention from the security team, highlight them here.

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: +0.02 🎉

Comparison is base (dbf2067) 40.89% compared to head (3c07345) 40.91%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1784      +/-   ##
===========================================
+ Coverage    40.89%   40.91%   +0.02%     
===========================================
  Files          359      359              
  Lines        11071    11075       +4     
  Branches      2826     2827       +1     
===========================================
+ Hits          4527     4531       +4     
- Misses        4277     4278       +1     
+ Partials      2267     2266       -1     

Impacted Files	Coverage Δ
...c/app/notebook/notebook-stream-output.component.ts	50.00% <33.33%> (ø)

... and 2 files with indirect coverage changes

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