Tests do not test ./configure --ninja

[cclauss]

**Is your feature request related to a problem? Please describe.
Neither our Travis nor Jenkins tests seem to cover ./configure --ninja

Describe the solution you'd like
Please describe the desired behavior.

Describe alternatives you've considered
Please describe alternative solutions or features you have considered.

[sam-github]

See: #29371 (comment)

[gengjiawen]

Should be resolved by #30057