Forbid Micro and Nano instances in aws eks

[nsarupr]

Description

Forbid users from using micro and nano instances in AWS EKS.

Safety checklist

• This change is backwards compatible and safe to apply by existing users
• This change will NOT lead to data loss
• This change will NOT lead to downtime who already has an env/service setup

How has this change been tested, beside unit tests?

Tested and validated manually.

name: testenv
org_name: runx
providers:
  aws:
    region: us-east-1
    account_id: 000000000000
modules:
  - type: base
  - type: k8s-cluster
    node_instance_type: "t2.nano"
  - type: k8s-base

$> opta apply -c aws-env.yml
Opta file validation failed with errors:
  : modules.1: node_instance_type: t2.nano is not a regex match.
ERROR: aws-env.yml is not a valid Opta file.
If you need more help please reach out to the contributors in our slack channel at: https://slack.opta.dev

[juandiegopalomino]

also on the nodegroup

[nsarupr]

also on the nodegroup

I thought there we should let the users have an option to have a lesser instance type

[codecov]

Codecov Report

Merging #875 (3e1ab6f) into main (5f1404d) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #875      +/-   ##
==========================================
- Coverage   73.48%   73.46%   -0.02%     
==========================================
  Files         123      123              
  Lines        8188     8190       +2     
==========================================
  Hits         6017     6017              
- Misses       2171     2173       +2     

Flag	Coverage Δ
unittests	73.46% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
opta/commands/logs.py	75.60% <0.00%> (-3.88%)	⬇️

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