Enable --fail-fast by default for E2E and performance tests.

[blackpiglet]

Thank you for contributing to Velero!

Please add a summary of your change

Does your change fix a particular issue?

Fixes #7883

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.23%. Comparing base (46801a0) to head (f1846be).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8202      +/-   ##
==========================================
+ Coverage   59.21%   59.23%   +0.01%     
==========================================
  Files         367      367              
  Lines       30708    30708              
==========================================
+ Hits        18184    18190       +6     
+ Misses      11069    11064       -5     
+ Partials     1455     1454       -1     

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[kaovilai]

Matches docs