Issue #4164: Changing twig and yaml linting namespace

[ba66e77]

... references from tests: to validate: namespace.

Fixes #4164

Changes proposed

(What are you proposing we change? How does this impact end users? Are manual or automatic updates required?)

• Change the namespace used for twig and yaml linting from tests: to validate:. The commands themselves appear to already have been moved and only their invocation in a couple places and documentation still needs to change.

• Found essentially the same thing with the git commit invocation of tests:composer:validate, which should be validate:composer.

Steps to replicate the issue

1. With BLT 12.0.0, make some changes, add them to git, and run git commit -m "Whatever."
2. Observe error message as below.

Previous (bad) behavior, before applying PR

Running git commit without --no-verify on the 12.0.0 release of BLT results in an error saying

[CompletionWrapper] There are no commands defined in the "tests:twig:lint" namespace.

Expected behavior, after applying PR and re-running test steps

No error message displayed

[danepowell]

Thanks, that makes sense!