Included `@parcel/watcher` in the list of packages allowed in the postinstall checks test.

(cherry picked from commit 416c9aa)

… cases

Previously the `fileReplacements` option within the `application` builder
would only replace `.js` files if the TypeScript `allowJs` option was enabled.
This differs from the `browser` builder which did not require the option.
To minimize friction when migrating to the new build system, the `allowJs`
option is no longer required for this file replacement case.

(cherry picked from commit a325c9a)

(cherry picked from commit af14769)

…ced variables

Sass variable namespaces can contain either a hyphen or underscore in the namespace
identifier. The URL rebasing support within the Angular CLI will now account for
these type of namespaces and rebase the evaluated URL as expected.

(cherry picked from commit f96bb86)