Expose the built-in karma config. #24294
Description
Command
test
Description
Angular 15 hides the cli config files. This is admirable, but this means that tools depending on this config cannot work. For example, StrykerJS needs this configuration. See stryker-mutator/stryker-js#3871
Describe the solution you'd like
I would love for the cli to expose this built-in config, similar to how the vue cli exposes webpack config as a file.
An added benefit is that users of Angular 15 can expand their custom karma config upon it instead of needing to copy it entirely and make adjustments.
Describe alternatives you've considered
No response