Default the max_request_size to 4MB

[kalroy]

🔩 Description: What code changed, and why?

We need to set the default value for chef_server_default_max_size to 4MB instead of 2MB.

⛓️ Related Resources

https://chefio.atlassian.net/browse/CHEF-1471
https://chefio.atlassian.net/browse/IN-969

👍 Definition of Done

• The config size should be set in the opscode_erchef['max_request_size'] in /etc/opscode/chef-server.rb files in CS nodes in case of Automate HA and in the Automate instance

👟 How to Build and Test the Change

• hab studio enter
• start_all_services
• start_chef_server
• check the config

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[Dmaddu]

can we add doc changes as well to this PR?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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