Improve Find in Files support for built-in resources

[TheDying0fLight]

What problem(s) does this PR solve?

• Closes Make Find in Files functional on built-in scripts godot-proposals#9436
• Closes Find in Files: Shader results in tscn file don't open shader editor #121969
• Closes Find in Files: Selecting tscn result located after GDScript resource opens it in script editor #121970
• Supersedes Implement file-extension-aware Scanner and Replacer for the FindInFilesPanel #75607

Additional information

This PR tries to give search and replace in files decent support for built-in shaders/scripts

Features

• Correctly opens Shader matches in the shader editor when clicked on
• No longer opens random scripts when clicking on a result from a tscn which does not belong to a script that can be opened. Added an error messages for this
• Searches tscn files for Shader/GDScript sub_resource when gd/gdshader is set (even when tscn isn't)
• Adds resource ids to matches in open scenes
• Only returns matches in shader/script section in tscn files if the scene is open.

Notes

• Built-in search only works on scripts that have been saved at least once since Find in Files currently only searches through files on the disk and checks if they are open in editors
• When searching an open scene only matches for gd and gdshader can be found
• Moved _on_find_in_files_result_selected to EditorNode and renamed it to edit_text_resource so it can be reused (for example in Show shader editor on shader compilation error #112954)

---

Scene open

Scene closed

[KoBeWi]

Searches tscn files for Shader/GDScript sub_resource when gd/gdshader is set (even when tscn isn't)

That makes searching longer, no?

Built-in search only works on saved data and reloads the scene after replacing (not sure if the used way is the best to reload a scene, it works but closes open editors)

You can fetch Script/Shader resources from ResourceCache using their internal path/ID, and patch them if they exist, similar to #114300

[TheDying0fLight]

That makes searching longer, no?

Yes. If that is an issue I'd suggest an editor setting which can also be toggled directly in the Find in Files options so users can discover it easily

You can fetch Script/Shader resources from ResourceCache using their internal path/ID, and patch them if they exist, similar to #114300

I tried this but had some issues. Now that I look at it again I have some new ideas to approach it and will look more closely at it tomorrow

[TheDying0fLight]

You can fetch Script/Shader resources from ResourceCache using their internal path/ID, and patch them if they exist, similar to #114300

I tried this but had some issues. Now that I look at it again I have some new ideas to approach it and will look more closely at it tomorrow

Searching/Replacing now works in Script/Shader resources of an open scene but will not return any other results. I had to adjust is_unsaved and use set_edited(false) in some places to make sure changes in resources not open in an editor are correctly marked as unsaved while avoiding built-in resources to always be marked as unsaved. I'm not 100% sure the set_edited(false) usage doesn't break anything but it should be fine since I use it at places where the resources are loaded (Though I just realized that this needs TOOLS_ENABLED)