[AIRFLOW-5834] Option to skip serve_logs process with workers

[msumit]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira i
  • https://issues.apache.org/jira/browse/AIRFLOW-5834

Description

• Adding an option to skip serve logs process starting with workers. With the advent of K8s, serving logs from workers isn't useful anymore. Also, fundamentally it feels wrong to serve two entirely diff processes from one command.

Tests

• Added unit tests

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
  • If you implement backwards incompatible changes, please leave a note in the Updating.md so we can assign it to a appropriate release

[codecov-io]

Codecov Report

Merging #6709 into master will decrease coverage by 0.28%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master    #6709      +/-   ##
==========================================
- Coverage   83.83%   83.55%   -0.29%     
==========================================
  Files         668      668              
  Lines       37569    37575       +6     
==========================================
- Hits        31497    31395     -102     
- Misses       6072     6180     +108

Impacted Files	Coverage Δ
airflow/bin/cli.py	92.64% <ø> (ø)	⬆️
airflow/cli/commands/worker_command.py	77.08% <88.88%> (+38.98%)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	78.2% <0%> (-20.52%)	⬇️
airflow/jobs/local_task_job.py	85% <0%> (-5%)	⬇️
airflow/configuration.py	89.13% <0%> (-3.63%)	⬇️
airflow/utils/dag_processing.py	58.15% <0%> (+0.16%)	⬆️
... and 1 more

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