Add back an instance_types rake task

[agrare]

There used to be a rake task to auto-generate the instance_types.rb (at least as early as #170)

It was removed in #449 with the plan of pulling this info from the AWS API/SDK however that never materialized.

This manifested in provisioning failing because the vpc_only attribute was flat out incorrect for a number of flavors which caused the auto-select logic to fail.

[agrare]

This was a legit bug in the current yaml, the network performance string is "Up To 10 Gigabit" which didn't match our exact "10 Gigabit" or "20 Gigabit" check

[Fryguy]

Overall LGTM - glad the script is relatively tiny.

[agrare]

For now I've limited this to just the existing flavors so that the diff cleaner and it is more obvious what is changed by specifically this generator. I will follow-up with the new flavors that have been added since this was last run in a separate PR.

[miq-bot]

Checked commit agrare@5605751 with ruby 2.6.3, rubocop 1.13.0, haml-lint 0.35.0, and yamllint
1 file checked, 1 offense detected

lib/tasks_private/instance_types.rake

• ❗ - Line 3, Col 3 - Rails/RakeEnvironment - Include :environment task as a dependency for all Rake tasks.

[Fryguy]

Backported to lasker in commit eae927b.

commit eae927bee2e0954f5f82f22283708ac6ac77f22d
Author: Jason Frey <fryguy9@gmail.com>
Date:   Fri May 28 14:57:21 2021 -0400

    Merge pull request #707 from agrare/add_instance_types_rake_task
    
    Add back an instance_types rake task
    
    (cherry picked from commit 216036c6845f5553a681cf8929a4abae68130528)