Disable the fields of all CRUD workflow actions on readonly mode

[Devessier]

Fixes https://discord.com/channels/1130383047699738754/1333822806504247467

In this PR:

• Make the workflow step title input readonly when the visualizer is in readonly mode
• Make all the fields of the Update Record and Delete Record readonly when the visualizer is in readonly mode
• Create stories for the Create Record, Updated Record and Delete Record actions; I'm checking for the default mode and several variants of the disabled mode
• Set up mocks for the workflows and use them in msw handlers

Follow up:

• We use readonly and disabled alternatively; these are two different states when talking about a HTML <input /> element. I think we should settle on a single word.
• Refactor the <WorkflowSingleRecordPicker /> component to behave as other selects

Current component	Should look like

[greptile-apps]

PR Summary

This PR implements readonly functionality across workflow action forms, focusing on consistent form field behavior in readonly mode.

Key changes:

• Added disabled state to WorkflowStepHeader component for readonly workflow visualizer mode
• Implemented comprehensive Storybook test coverage with stories for Create/Update/Delete Record actions in both default and disabled states
• Added testId props throughout components for improved testability
• Created WorkflowStepDecorator to set up workflow state for component testing
• Introduced mock data and GraphQL handlers for workflow-related operations

Note: The PR raises an important issue about standardizing terminology between 'readonly' and 'disabled' states across components, which should be addressed in follow-up work.

_{15 file(s) reviewed, 9 comment(s)
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[bosiraphael]

LGTM, left a couple of comments

[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5591:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5562:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5571:7)�[39m
danger-results://tmp/danger-results-2d52eb07.json

Generated by 🚫 dangerJS against 9ef6f2b