Update airflow resource requests and limits

The ITs for glab environment are failing because of timeout. This is due to the unavailability of enough resources to execute dag runs in case the number of dags in the airflow increases. Since this slows down the dag runs execution leading to timeout, hence, we need to request for more resources for the following -

1. Airflow - WebUI
2. Airflow - Worker
3. Airflow - Scheduler

Link to the MR: !331 (merged)

cc: @vineethguna @kibattul