hcl2template: remove value validation for locals

Local variables can't have a validation block in their definition, so
this step in not useful and should be removed.

Besides, since the validation was done on the local variables before
evaluation, it did nothing at all, as the PackerConfig.LocalVariables
collection gets populated during evaluation, so this is essentially a
no-op, and can be safely removed.

hcl2template/parser.go

@@ -295,7 +295,6 @@ func filterVarsFromLogs(inputOrLocal Variables) {
 
 func (cfg *PackerConfig) Initialize(opts packer.InitializeOptions) hcl.Diagnostics {
 	diags := cfg.InputVariables.ValidateValues()
-	diags = append(diags, cfg.LocalVariables.ValidateValues()...)
 	diags = append(diags, cfg.evaluateDatasources(opts.SkipDatasourcesExecution)...)
 	diags = append(diags, checkForDuplicateLocalDefinition(cfg.LocalBlocks)...)
 	diags = append(diags, cfg.evaluateLocalVariables(cfg.LocalBlocks)...)