💡 Added logic to remove whitespace from the line

[babakamyljanovssw]

cc: @bradystroud @Calinator444 @tkapa @BrookJeynes

Relates to #1448

Added logic to gatsby-node.js to remove whitespace from lines that contains only whitespace.
Then tested yarn build with new logic and without it.

For testing created test-sample-content branch in content repo, and added intentional whitespace to the rule.

Figure: Line 67 contains a whitespace

As result:

• ✅ build is successful with new logic
• ❌ build fails without new logic, and the error message was same that we have seen in recent workflow failures.

Figure: Build fails without new logic

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🤖 Copilot's summary

This pull request includes changes to the gatsby-node.js file to improve the handling of Markdown content and streamline the code.

Content handling improvements:

• gatsby-node.js: Added logic to trim empty lines from the Markdown content before processing. This ensures that unnecessary whitespace is removed, leading to cleaner content handling.

Codebase simplification:

• gatsby-node.js: Added a new line after the onCreateNode function for better readability and separation of concerns.

[bradystroud]

This PR is awesome ⁠

I know the fix was super simple, but i think its worth making a Done Video since it could help other people

1. Create an issue on the Gatsby repo for this problem (link to the PR to show how you fixed it)
2. Add a TODO comment with a link to the issue
3. Record a video showing the problem and how you fixed it

[babakamyljanovssw]

Hi @bradystroud

✅ All done

Issue on gatsby repo - gatsbyjs/gatsby#39136
Video - https://youtu.be/tfoEjDFW-U0