fix(editor): Prevent error from showing-up when duplicating unsaved workflow

[OlegIvaniv]

In the DuplicateWorkflowDialog modal we were using getWorkflowById to get the current workflow data. But if the workflow is not saved, it's not stored in workflowsById so it can't be retrieved and would throw an error. Instead, we use the current workflow data(workflowsStore.workflow) if the id is PLACEHOLDER_EMPTY_WORKFLOW_ID and current workflows id is also PLACEHOLDER_EMPTY_WORKFLOW_ID.
Github issue / Community forum post (link here to close automatically):

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching packages/**:

• If fixing bug, added test to cover scenario.
• If addressing forum or Github issue, added link to description.

Files matching **/*.vue:

• Used composition API for all new components.
• Added component or unit tests to cover functionality.

Files matching packages/editor-ui/**/*.vue:

• Added E2E if adding new features.
• Used design system tokens (colors, spacings...) where possible.

Files matching cypress/e2e/**:

• Avoided chaining commands more than two or three times (to avoid flakiness because only last one will be retried).
• Spoofed endpoints that are not critical for the test (to avoid flakiness).
• Picked most efficient path to start the test (for example skipped account setup and starting at /workflow/new for a canvas test).
• Avoided adding waits on time (use request intercepts instead).
• Ensured each spec does not depend on any another spec to pass.

Make sure to check off this list before asking for review.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (58fda25) 14.84% compared to head (46c9f49) 14.84%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5833   +/-   ##
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  Coverage   14.84%   14.84%           
=======================================
  Files        2475     2475           
  Lines      113363   113371    +8     
  Branches    17702    17704    +2     
=======================================
+ Hits        16826    16829    +3     
- Misses      95993    95997    +4     
- Partials      544      545    +1     

see 7 files with indirect coverage changes

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[janober]

Got released with n8n@0.223.0