[FORMS] Add Share a Form action to Slack docs

[JohanDelao]

What does this PR do? What is the motivation?

Merge readiness

• Ready for merge

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Additional notes

[JohanDelao]

• [FORMS] Add Share a Form action to Slack docs #39886 👈 (View in Graphite)
• master

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[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/johan.delao/include-form-slack-action/integrations/guide/slack-actions

[JohanDelao]

/review

[github-actions]

🤖 Automated review by Claude. AI-generated; verify before acting.

Small, clean addition. The new Forms section mirrors the existing structure, the reference link resolves to a valid page (hugo/content/en/actions/forms/_index.md), and the frontmatter description is updated to include forms. No blockers.

_{Reviewed 291b3ec4595275ec1e246e9e3268e1269888b1bd — workflow run}

[drichards-87]

Suggested change

	## Forms
	Use the following commands for Forms. For more information, see [Forms][8].
	## Forms
	{{% site-region region="gov,gov2" %}}
	<div class="alert alert-warning">
	The <strong>Share a Form</strong> Slack action is not supported in the {{< region-param key="dd_site_name" >}} site.
	</div>
	{{% /site-region %}}
	Use the following commands for Forms. For more information, see [Forms][8].

[drichards-87]

Suggested change

	| `/dd`, then select **Share a Form** | Search for a Datadog form and share it to this channel, where recipients can fill it out in Slack or open it in Datadog. Not available in Gov and Gov2 regions.|
	| `/dd`, then select **Share a Form** | Search for a Datadog form and share it to this channel, where recipients can fill it out in Slack or open it in Datadog. |

[drichards-87]

I recommend using the site-region shortcode to dynamically show that this action isn't available in the US1-FED and US2-FED site regions. (See my other suggestion above this one.)