Remove workspace-hack (#40216)

We've been considering removing workspace-hack for a couple reasons:
- Lukas ran into a situation where its build script seemed to be causing
spurious rebuilds. This seems more likely to be a cargo bug than an
issue with workspace-hack itself (given that it has an empty build
script), but we don't necessarily want to take the time to hunt that
down right now.
- Marshall mentioned hakari interacts poorly with automated crate
updates (in our case provided by rennovate) because you'd need to have
`cargo hakari generate && cargo hakari manage-deps` after their changes
and we prefer to not have actions that make commits.

Currently removing workspace-hack causes our workspace to grow from
~1700 to ~2000 crates being built (depending on platform), which is
mainly a problem when you're building the whole workspace or running
tests across the the normal and remote binaries (which is where
feature-unification nets us the most sharing). It doesn't impact
incremental times noticeably when you're just iterating on `-p zed`, and
we'll hopefully get these savings back in the future when
rust-lang/cargo#14774 (which re-implements the functionality of hakari)
is finished.

Release Notes:

- N/A

script/new-crate

@@ -63,7 +63,6 @@ anyhow.workspace = true
 gpui.workspace = true
 ui.workspace = true
 util.workspace = true
-workspace-hack.workspace = true
 
 # Uncomment other workspace dependencies as needed
 # assistant.workspace = true

script/update-workspace-hack

@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-
-set -euo pipefail
-
-HAKARI_VERSION="0.9"
-
-cd "$(dirname "$0")/.." || exit 1
-
-if ! cargo hakari --version | grep "cargo-hakari $HAKARI_VERSION" >/dev/null; then
-    echo "Installing cargo-hakari@^$HAKARI_VERSION..."
-    cargo install "cargo-hakari@^$HAKARI_VERSION"
-else
-    echo "cargo-hakari@^$HAKARI_VERSION is already installed."
-fi
-
-# update the workspace-hack crate
-cargo hakari generate
-
-# make sure workspace-hack is added as a dep for all crates in the workspace
-cargo hakari manage-deps

script/update-workspace-hack.ps1

@@ -1,36 +0,0 @@
-$ErrorActionPreference = "Stop"
-
-$HAKARI_VERSION = "0.9"
-
-$scriptPath = Split-Path -Parent $MyInvocation.MyCommand.Path
-Set-Location (Split-Path -Parent $scriptPath)
-
-$hakariInstalled = $false
-try {
-    $versionOutput = cargo hakari --version 2>&1
-    if ($versionOutput -match "cargo-hakari $HAKARI_VERSION") {
-        $hakariInstalled = $true
-    }
-}
-catch {
-    $hakariInstalled = $false
-}
-
-if (-not $hakariInstalled) {
-    Write-Host "Installing cargo-hakari@^$HAKARI_VERSION..."
-    cargo install "cargo-hakari@^$HAKARI_VERSION"
-    if ($LASTEXITCODE -ne 0) {
-        throw "Failed to install cargo-hakari@^$HAKARI_VERSION"
-    }
-}
-else {
-    Write-Host "cargo-hakari@^$HAKARI_VERSION is already installed."
-}
-
-# update the workspace-hack crate
-cargo hakari generate
-if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
-
-# make sure workspace-hack is added as a dep for all crates in the workspace
-cargo hakari manage-deps
-if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }