fix(frontend): Vite Google Analytics config

[eatyourgreens]

Use loadEnv to load the .env file dynamically at build time. Otherwise, VITE_APP_GA_ID isn't injected into the Docker build environment.

[sonarcloud[bot]]

Quality Gate passed for 'pkpdapp'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'pkpdapp-team_pkpdapp_frontend'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.78%. Comparing base (f405a25) to head (671e782).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #487 +/- ## ============================================ Coverage 76.78% 76.78% ============================================ Files 108 108 Lines 5609 5609 ============================================ Hits 4307 4307 Misses 1302 1302 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.