chore: add tracking service to portalicious

[aberonni]

AB#33897

Describe your changes

Following up on the work done by @elwinschmitz in #6535 - I decided to refactor some of the conditions into a separate service, similarly to what was done with the authservice, so that the application as a whole is unaware (and does not care) whether Matomo is enabled / configured for the current instance.

Checklist before requesting a review

• I have performed a self-review of my code
• I have added tests wherever relevant
• I have made sure that all automated checks pass before requesting a review
• I do not need any deviation from our PR guidelines

Portalicious preview deployment

https://lively-river-04adce503-6539.westeurope.5.azurestaticapps.net

Copilot reviewed 5 out of 7 changed files in this pull request and generated no comments.

Files not reviewed (2)

• interfaces/Portalicious/src/app/pages/privacy/privacy.page.html: Language not supported
• interfaces/Portalicious/src/app/app.config.ts: Evaluated as low risk

Comments suppressed due to low confidence (1)

interfaces/Portalicious/src/app/services/tracking.service.ts:15

• The function IS_MATOMO_ENABLED should be a method of the TrackingService class to ensure it always returns the correct state based on the current environment variables.

const IS_MATOMO_ENABLED = () =>