add config validation by default

[shazron]

Right now, config validation is not turned on by default and only certain commands turn it on, like the app pack command:

aio-cli-plugin-app/src/commands/app/pack.js

Line 43 in 4fb2a25

const appConfig = await libConfig.load({ validateAppConfig: true })

Modify BaseCommand.getFullConfig to validate the app config by default - this means that all commands that call getFullConfig will validate the config by default, even if they don't use the whole config:
https://github.com/search?q=repo%3Aadobe%2Faio-cli-plugin-app%20getFullConfig&type=code

BaseCommand.getFullConfig:

aio-cli-plugin-app/src/BaseCommand.js

Line 147 in 4fb2a25

const validateAppConfig = options.validateAppConfig === true

Provide a shared flag in the BaseCommand to turn off config validation, just in case there are issues:

• The flag should be called config-validation and allowsNo : true, default: true.
• The getFullConfig method should read the flag directly
• every command that inherits from BaseCommand must spread the BaseCommand flags

[aiojbot]

JIRA issue created: https://jira.corp.adobe.com/browse/ACNA-3510