Adding new text block via dropdown when current block is empty

[Abhishek-17h]

• I signed and returned the Plone Contributor Agreement, and received and accepted an invitation to join a team in the Plone GitHub organization.
• I verified there aren't other open pull requests for the same change.
• I followed the guidelines in Contributing to Volto.
• I succesfully ran code linting checks on my changes locally.
• I succesfully ran unit tests on my changes locally.
• I succesfully ran acceptance tests on my changes locally.
• If needed, I added new tests for my changes.
• If needed, I added documentation for my changes, either in the Storybook or narrative documentation.
• I included a change log entry in my commits.

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The video showcases the behavior after the feature for clarity:
Screencast from 2025-01-12 12-21-31.webm

Closes #6574

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[Abhishek-17h]

@stevepiercy @sneridagh provide review on this.

[stevepiercy]

I modified the change log so that it says both what was broken and fixed. Otherwise LGTM. Thanks for your work!

[stevepiercy]

Suggested change

	Implemented functionality to add a new text block via the dropdown menu, even when the current text block is empty. @Abhishek-17h
	You can now add a text block by clicking the circled `+` icon ("Add" block button) and selecting "Text" from the pop-up menu. Previously no text block would be inserted. @Abhishek-17h

[stevepiercy]

This is nice work. Let's get the @plone/volto-team and @plone/volto-accessibility teams to give a technical review before merging.

[davisagli]

Please move setAddNewBlockOpened(false); outside of the conditional, since it's done in both branches and the order doesn't matter.

[Abhishek-17h]

@davisagli @stevepiercy Please have a look now.

[stevepiercy]

News looks good. Thanks for the review, @davisagli!

[Abhishek-17h]

hey @davisagli, if everything is good ,can please u merge this PR.

[sneridagh]

@Abhishek-17h Just out of curiosity, could you please tell me why do you have such rush in review and merging? Which are your motivations?

[Abhishek-17h]

@sneridagh It's not really about rushing ,my main intention is to ensure that the work I’ve done is on the right track. If it’s good enough, it can move forward. I’m still learning about how things are managed here, like whether PRs are discussed in meetings or asynchronously, so any guidance would be helpful. I apologise if I have done something wrong.