Avoid bundling the mock interceptor in prod env

[hannaeko]

Purpose

Exclude mock.interceptor.ts from the build file.

Context

Since Angular 9, the trick used to exclude mock.interceptor.ts no longer works. This PR aims at correcting that.

Changes

Import mock.interceptor.ts in the environment file instead of in app.module.ts .

How to test this PR

Before the change, after running npm run build

• The build size (as reported by the npm run build command) is 940.51 kB
• Some test domains can be found in the resulting bundle

  % grep -ic progress.afnic.fr dist/en/main.*.js
  1

  after,

• The build size (as reported by the npm run build command) is 914.67 kB
• No test domain can be found in the resulting bundle

  % grep -ic progress.afnic.fr dist/en/main.*.js
  0

[matsduf]

Can this be postponed to v2024.1 instead of adding it this late in the cycle? What will happen if the change is not done?