[influxdbv2] consolidate directly written init env vars into `.env`

[shantanoo-desai]

Description

For Telegraf Output plugin which requires information of Bucket, Token and Organization, extract the values previously set directly in the Docker Compose template file into the komponist.env.j2 similar to InfluxDBv2.

Tasks

• [x] refactor templates/services/docker-compose.influxdbv2.yml.j2
• [x] add the respective values as env vars into templates/komponist.env.j2
• [x] Add the env var placeholders in the Docker Compose Template for interpolation
• [x] refactor tests for influxdbv2 checks