Apply new input validation method for Create Plugin dialog

[eugene87222]

• Create Plugin dialog's validation should be changed for consistency #76681
• Add status panel to the create plugin dialog
• Remove unused info icons (for old validation)

[brno32]

If I'm not mistaken, instead of having a merge commit in your source branch you'll wanna rebase off of the upsteam master and squash all your commits into one.

[eugene87222]

@brno32 would you like to teach me how to merge them😢
My git tree becomes little messy right now

[brno32]

https://docs.godotengine.org/en/stable/contributing/workflow/pr_workflow.html#the-interactive-rebase

A bit simpler might be to first rebase

$ git pull --rebase upstream master

then squash your commits with git rebase -i HEAD~2

You'll need to force push after rewriting your history.

[eugene87222]

Hmm I think it would be more convenient for me to create a new PR given my current situation.
I just forgot to pull the latest code before starting to fix the issue😿. I'll remember to do it next time.