Stop running strings:validate:reference check

Up to now we have been running rake targets:

lint,
validate,
parallel_spec,

as of recently validate as sprung a new task strings:validate:reference this checks the REFERENCE.md is updated from the puppet strings.

Take this out since we do not want to run it. Running validate with trace is currently:

** Invoke validate (first_time)
** Execute validate
** Invoke syntax (first_time)
** Invoke syntax:manifests (first_time)
** Execute syntax:manifests
---> syntax:manifests
** Invoke syntax:templates (first_time)
** Execute syntax:templates
---> syntax:templates
** Invoke syntax:hiera (first_time)
** Invoke syntax:hiera:yaml (first_time)
** Execute syntax:hiera:yaml
---> syntax:hiera:yaml
** Execute syntax:hiera
** Execute syntax
** Invoke metadata_lint (first_time)
** Execute metadata_lint
** Invoke strings:validate:reference (first_time)
** Execute strings:validate:reference

so we replace with syntax, to achieve the same result minus the strings check.

** Invoke syntax (first_time)
** Invoke syntax:manifests (first_time)
** Execute syntax:manifests
---> syntax:manifests
** Invoke syntax:templates (first_time)
** Execute syntax:templates
---> syntax:templates
** Invoke syntax:hiera (first_time)
** Invoke syntax:hiera:yaml (first_time)
** Execute syntax:hiera:yaml
---> syntax:hiera:yaml
** Execute syntax:hiera
** Execute syntax

Also it makes far more sense to run syntax before lint since no point linting bad syntax.

The metadata_lint looks like it is being ran but in reality it is not since rubygem-metadata-lint-json is not installed. If referenced directly them metadata_lint task fails hard.

Contemplate metadata_lint with migration to Alma 9 and newer ruby.