Add action hook that allows adding custom builder tab content

[AbdiTolesa]

From discussion on #2682:

@AbdiTolesa I think this is too risky. I left a comment in Helpscout about how this is a breaking change https://secure.helpscout.net/conversation/3174611369/244321#thread-9700394418

I think we could add a new hook instead, and consider deprecating the old hook.

Let's leave deprecating for now though. I don't know if it's really worth trying to remove this one.

Originally posted by @Crabcyborg in #2682 (comment)

Related ticket: https://secure.helpscout.net/conversation/3174611369/244321

[coderabbitai]

📝 Walkthrough

Walkthrough

A new WordPress action hook frm_extra_form_builder_tabs was added to the form builder view at classes/views/frm-forms/add_field_links.php, enabling external handlers to inject additional tabs or content into the form builder UI.

Changes

Cohort / File(s)	Summary
Form Builder Extension Point classes/views/frm-forms/add_field_links.php	Added new action hook frm_extra_form_builder_tabs with PHPDoc documentation, allowing plugins to extend form builder UI by injecting additional tabs or content through the hook mechanism.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

A hop, a skip, a new hook takes flight, 🐰
frm_extra_form_builder_tabs shines bright,
Builders extend with a call divine,
Form creation flows through action's design! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main change: adding a WordPress action hook (frm_extra_form_builder_tabs) that enables custom builder tab content injection into the form builder UI.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add_hook_for_new_builder_tab_content

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[deepsource-io]

Here's the code health analysis summary for commits eaec45f..baf7508. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
PHP	✅ Success		View Check ↗
JavaScript	✅ Success		View Check ↗

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