remove std clip (#11131)

follow up to
- #11097

related to
- nushell/nu_scripts#674

> **Important**
> wait for in between Nushell 0.88.0 and 0.89.0

# Description
this PR removes the `std clip` command after it's been deprecated in
#11097 😋

# User-Facing Changes
`std clip` will no longer be available.

# Tests + Formatting

# After Submitting

crates/nu-std/std/mod.nu

@@ -90,127 +90,6 @@ export def --env "path add" [
     }
 }
 
-# print a command name as dimmed and italic
-def pretty-command [] {
-    let command = $in
-    return $"(ansi default_dimmed)(ansi default_italic)($command)(ansi reset)"
-}
-
-# give a hint error when the clip command is not available on the system
-def check-clipboard [
-    clipboard: string  # the clipboard command name
-    --system: string  # some information about the system running, for better error
-] {
-    if (which $clipboard | is-empty) {
-        error make --unspanned {
-            msg: $"(ansi red)clipboard_not_found(ansi reset):
-    you are running ($system)
-    but
-    the ($clipboard | pretty-command) clipboard command was not found on your system."
-        }
-    }
-}
-
-# put the end of a pipe into the system clipboard.
-#
-# Dependencies:
-#   - xclip on linux x11
-#   - wl-copy on linux wayland
-#   - clip.exe on windows
-#   - termux-api on termux
-#
-# Examples:
-#     put a simple string to the clipboard, will be stripped to remove ANSI sequences
-#     >_ "my wonderful string" | clip
-#     my wonderful string
-#     saved to clipboard (stripped)
-#
-#     put a whole table to the clipboard
-#     >_ ls *.toml | clip
-#     ╭───┬─────────────────────┬──────┬────────┬───────────────╮
-#     │ # │        name         │ type │  size  │   modified    │
-#     ├───┼─────────────────────┼──────┼────────┼───────────────┤
-#     │ 0 │ Cargo.toml          │ file │ 5.0 KB │ 3 minutes ago │
-#     │ 1 │ Cross.toml          │ file │  363 B │ 2 weeks ago   │
-#     │ 2 │ rust-toolchain.toml │ file │ 1.1 KB │ 2 weeks ago   │
-#     ╰───┴─────────────────────┴──────┴────────┴───────────────╯
-#
-#     saved to clipboard
-#
-#     put huge structured data in the clipboard, but silently
-#     >_ open Cargo.toml --raw | from toml | clip --silent
-#
-#     when the clipboard system command is not installed
-#     >_ "mm this is fishy..." | clip
-#     Error:
-#       × clipboard_not_found:
-#       │     you are using xorg on linux
-#       │     but
-#       │     the xclip clipboard command was not found on your system.
-export def clip [
-    --silent # do not print the content of the clipboard to the standard output
-    --no-notify  # do not throw a notification (only on linux)
-    --no-strip # do not strip ANSI escape sequences from a string
-    --expand (-e) # auto-expand the data given as input
-    --codepage (-c): int  # the id of the codepage to use (only on Windows), see https://en.wikipedia.org/wiki/Windows_code_page, e.g. 65001 is for UTF-8
-] {
-    let input = $in
-
-    print $"Warning:   (char -u 26a0) (ansi yellow_bold)deprecated_command(ansi reset)"
-    print "| the `std clip` command is deprecated and will be removed in Nushell 0.89"
-    print ""
-    print $"(ansi cyan)help(ansi reset): please use (ansi {fg: cyan, attr: du})[`modules/system clip`]\(https://github.com/nushell/nu_scripts/tree/main/modules#system\)(ansi reset)"
-
-    let input = $input
-        | if $expand { table --expand } else { table }
-        | into string
-        | if $no_strip {} else { ansi strip }
-
-    match $nu.os-info.name {
-        "linux" => {
-            if ($env.WAYLAND_DISPLAY? | is-empty) {
-                check-clipboard xclip --system $"('xorg' | pretty-command) on linux"
-                $input | xclip -sel clip
-            } else {
-                check-clipboard wl-copy --system $"('wayland' | pretty-command) on linux"
-                $input | wl-copy
-            }
-        },
-        "windows" => {
-            if $codepage != null {
-                chcp $codepage
-            }
-            check-clipboard clip.exe --system "Windows"
-            $input | clip.exe
-        },
-        "macos" => {
-            check-clipboard pbcopy --system "MacOS"
-            $input | pbcopy
-        },
-        "android" => {
-            check-clipboard termux-clipboard-set --system "Termux"
-            $input | termux-clipboard-set
-        },
-        _ => {
-            error make --unspanned {
-                msg: $"(ansi red)unknown_operating_system(ansi reset):
-    '($nu.os-info.name)' is not supported by the ('clip' | pretty-command) command.
-
-    please open a feature request in the [issue tracker](char lparen)https://github.com/nushell/nushell/issues/new/choose(char rparen) to add your operating system to the standard library."
-            }
-        },
-    }
-
-    if not $silent {
-        print $input
-        print $"(ansi white_italic)(ansi white_dimmed)saved to clipboard(ansi reset)"
-    }
-
-    if (not $no_notify) and ($nu.os-info.name == linux) {
-        notify-send "std clip" "saved to clipboard"
-    }
-}
-
 # convert an integer amount of nanoseconds to a real duration
 def "from ns" [] {
     [$in "ns"] | str join | into duration