Add Slack Command to Trigger Internal Reports by Org, Site, and Audit Type

[byteakp]

Add Slack Command to Trigger Internal Reports by Org, Site, and Audit Type

This PR introduces support for selectively running internal reports via the Slack command /run internal report using up to four arguments:
/run internal report [reportType] [orgId] [siteBaseURL] [auditType]

This enhancement allows users to target specific orgs, sites, or audit types when retriggering reports, avoiding the need to rerun reports for all customers — particularly useful when fixing bugs or reprocessing failed audits.

✅ Key Features

• Accepts optional arguments: orgId, siteBaseURL, auditType
• Sends filtered SQS message to the reports queue
• Helps resolve repeated manual reprocessing
• Improves support and ops workflows

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🧪 Tests

Added unit tests to cover:

• Command with no filters (default behavior)
• Command with orgId only
• orgId + siteBaseURL
• orgId + siteBaseURL + auditType

Each test verifies the correct SQS message structure is sent.

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📌 Notes

• Downstream services (like spacecat-jobs-dispatcher) must support filtering on these fields.
• Help text for the Slack command has been updated accordingly.
• No changes were made to the backend API controllers.

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🔗 Related Issues

Closes #235
Slack command/API to (re)trigger reporting for a specific org/site and audit type