Application defined entry points (`browser`/`server`) are disabled when
using the experimental unit-test builder. This allows the unit test files
themselves to become the entry points for testing purposes. Previously,
the `outputMode` option was not also disabled. This lead to errors if it
was present in the build target configuration used for `unit-test` due to
the `outputMode` option requiring the `server` option.

(cherry picked from commit 020527e)

The JSON file helper utility used within the Angular schematics now
contains additional checks when attempting to modify a file to avoid
overwriting a file if no actual changes will occur after a modify request.

(cherry picked from commit 664e6c7)

…uring application migration

When performing an `ng update` to Angular v20, the application migration
will detect the usage of the `karma` builder's `karmaConfig` option and
attempt to remove usages of the no longer needed `@angular-devkit/build-angular`
karma framework and plugin usage. While the karma framework usage will be
specifically ignored when using the `@angular/build:karma` builder, the
plugin usage leverages a direct `require` within the configuration file.
Regardless of the ability of the builder to ignore, neither usage is
needed with `@angular/build:karma` and removing the code aligns
with what would be generated by `ng generate config karma`.

(cherry picked from commit a2aba4c)

… root

To maintain behavior with the Webpack-based karma unit-testing available
via `@angular-devkit/build-angular`, the application build system based
karma testing will now resolve the output directory location of the junit
karma reporter to the same workspace root location.  This is only performed
if the `junit` reporter is enabled and the reporter's `outputDir` option
is not an absolute path.

(cherry picked from commit bec42f7)

…ations

A newly generated application no longer adds the `zone.js` dependency to
the workspace if the `zoneless` option is enabled.

(cherry picked from commit 7ca250a)

Enhances the Node.js version validation to include Node.js 22.12

(cherry picked from commit abe69dd)