[Wrangler] add wrangler workflows delete command, workers/wrangler/commands.mdx

[avenceslau]

Summary

Closes #22155, Added docs for wrangler workflows delete

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added documentation for the new 'delete' command in wrangler workflows, allowing users to delete a workflow and its instances.

• Introduced the 'delete' command for workflows in the documentation.
• Provided usage examples for the 'delete' command.
• Clarified the required parameter for the 'delete' command.

Modified Files

• src/content/docs/workers/wrangler/commands.mdx

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