Remove default values of ExcludeTag parameter in favor of opt-in

[johlju]

Since the parameter ExcludeTag on the function Invoke-AppveyorTestScriptTaskis not intuitive.
I wonder if we can make it obsolete, or rather remove the default values, by using opt-in.

It defaults to 'Examples' and 'Markdown'.

DscResource.Tests/AppVeyor.psm1

Line 164 in 60efdea

$ExcludeTag = @('Examples', 'Markdown'),

They are meant to exclude the meta tests (common tests) for examples and markdown.

DscResource.Tests/AppVeyor.psm1

Lines 231 to 236 in 60efdea

	if ($ExcludeTag.Count -gt 0)
	{
	$pesterParameters += @{
	ExcludeTag = $ExcludeTag
	}
	}

But the tests with markdown has already an opt-in.

DscResource.Tests/Meta.Tests.ps1

Lines 849 to 850 in 60efdea

	Describe 'Common Tests - Validate Markdown Files' -Tag 'Markdown' {
	$optIn = Get-PesterDescribeOptInStatus -OptIns $optIns

Same with the example tests.

DscResource.Tests/Meta.Tests.ps1

Lines 582 to 583 in 60efdea

	Describe 'Common Tests - Validate Example Files' -Tag 'Examples' {
	$optIn = Get-PesterDescribeOptInStatus -OptIns $optIns

DscResource.Tests/Meta.Tests.ps1

Lines 761 to 762 in 60efdea

	Describe 'Common Tests - Validate Example Files To Be Published' -Tag 'Examples' {
	$optIn = Get-PesterDescribeOptInStatus -OptIns $optIns

So I think it is safe to remove the default values from this parameter, since all those thests must be opt-in by op-tin in the file .MetaTestOptIn.json.

DscResource.Tests/.MetaTestOptIn.json

Lines 1 to 6 in 60efdea

	[
	"Common Tests - Validate Module Files",
	"Common Tests - Validate Markdown Files",
	"Common Tests - Validate Example Files",
	"Common Tests - Validate Script Files"
	]

[johlju]

With this change, each repo can use the parameter to correctly exclude tag they prefer.