Address overview pages that do not meet content requirements

[sean1588]

We added a check to the registry to ensure the package overview page is not blank and also contains a minimal amount of content (at least 250 characters). We have added the current failing packages to an exceptions list for now in order to get the tests passing until these get addressed.

Here is a list of the current failures:

ERROR: The content in the overview file, themes/default/content/registry/packages/heroku/_index.md, does not meet the 250 character minimum requirement for content.
ERROR: The content in the overview file, themes/default/content/registry/packages/junipermist/_index.md, does not meet the 250 character minimum requirement for content.
ERROR: The content in the overview file, themes/default/content/registry/packages/meraki/_index.md, does not meet the 250 character minimum requirement for content.
ERROR: The content in the overview file, themes/default/content/registry/packages/packet/_index.md, does not meet the 250 character minimum requirement for content.
ERROR: The content in the overview file, themes/default/content/registry/packages/sdwan/_index.md, does not meet the 250 character minimum requirement for content.

We need to get heroku, junipermist, meraki, packet, and sdwan addessed.

[iwahbe]

The check is here:

registry/scripts/ci/validate-packages.sh

Lines 50 to 51 in 13f5f8f

	# TODO: Remove this line and the reference to excluded_pkgs below when https://github.com/pulumi/registry/issues/5307 is resolved.
	excluded_pkgs=("heroku" "junipermist" "meraki" "packet" "sdwan")

[iwahbe]

Let's reconsider this as a P1. I'm not sure we should address this in the general case, but I'm doubly unsure this needs to be prioritized to the next item, having sat unaddressed and unassigned for 2 months.

[iwahbe]

• We don't own pulumi-heroku, so I'm not sure we should track the status of it's documentation.
• Fleshing out pulumi-junipermist's _index.md page is blocked on [docs] Tables rendered as such strip the next header pulumi-terraform-bridge#2466.
• pulumi-meraki does meet the requirement.
• pulumi-packet has been deprecated and archived: https://github.com/pulumi/pulumi-packet.
• pulumi-sdwan is also blocked on [docs] Tables rendered as such strip the next header pulumi-terraform-bridge#2466.