🐛 Fix shell completions for the fish shell

[goraje]

As described in this discussion #1068, recent changes aimed at sanitizing the help text from rich tags during autocompletion generation (#877) have caused problems with proper generation of autocompletions for fish shell, when rich is installed in the environment. The main culprit most likely being the rich.Console.print method that converts the tabs into spaces which results in malformed autocompletes. I propose a different approach to sanitizing the help text, one that allows to perform the removal of tags before the output of format_completion gets returned, thus allowing to generate a rich tag-free help text, while still being able to pass it to a formatting-preserving output via click.echo in typer.completion (basically reverting this part of the source to the way it was before the #877 changes).

An example of the current behaviour while using rich.Console.print invoked in typer.rich_utils.print_with_rich:

testapp example1\ \ \ Just\ some\ help\ for\ example1

with an example app of the following structure:

from typing import Annotated

import typer
from rich.markup import escape

app = typer.Typer(no_args_is_help=True, rich_markup_mode="rich")

@app.command(name="example1", help="Just [bold]some[/] help for example1")
def example1(name: Annotated[str, typer.Option(help="name")]) -> None:
    pass

@app.command(name="example2", help=f"Just some help for example2 {escape('[I'm just text in brackets]')}")
def example2() -> None:
    pass

def main() -> None:
    app()

[svlandeg]

Thanks for the detailed report and PR! I'll look into this 🙏