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

.github/workflows/ci.yml

@@ -130,39 +130,6 @@ jobs:
           input: "crates/proto/proto/"
           against: "https://github.com/${GITHUB_REPOSITORY}.git#branch=${BUF_BASE_BRANCH},subdir=crates/proto/proto/"
 
-  workspace_hack:
-    timeout-minutes: 60
-    name: Check workspace-hack crate
-    needs: [job_spec]
-    if: |
-      github.repository_owner == 'zed-industries' &&
-      needs.job_spec.outputs.run_tests == 'true'
-    runs-on:
-      - namespace-profile-8x16-ubuntu-2204
-    steps:
-      - name: Checkout repo
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
-      - name: Add Rust to the PATH
-        run: echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
-      - name: Install cargo-hakari
-        uses: clechasseur/rs-cargo@8435b10f6e71c2e3d4d3b7573003a8ce4bfc6386 # v2
-        with:
-          command: install
-          args: cargo-hakari@0.9.35
-
-      - name: Check workspace-hack Cargo.toml is up-to-date
-        run: |
-          cargo hakari generate --diff || {
-            echo "To fix, run script/update-workspace-hack or script/update-workspace-hack.ps1";
-            false
-          }
-      - name: Check all crates depend on workspace-hack
-        run: |
-          cargo hakari manage-deps --dry-run || {
-            echo "To fix, run script/update-workspace-hack or script/update-workspace-hack.ps1"
-            false
-          }
-
   style:
     timeout-minutes: 60
     name: Check formatting and spelling
@@ -507,7 +474,6 @@ jobs:
       - actionlint
       - migration_checks
       # run_tests: If adding required tests, add them here and to script below.
-      - workspace_hack
       - linux_tests
       - build_remote_server
       - macos_tests
@@ -533,7 +499,6 @@ jobs:
 
           # Only check test jobs if they were supposed to run
           if [[ "${{ needs.job_spec.outputs.run_tests }}" == "true" ]]; then
-            [[ "${{ needs.workspace_hack.result }}"       != 'success' ]] && { RET_CODE=1; echo "Workspace Hack failed"; }
             [[ "${{ needs.macos_tests.result }}"          != 'success' ]] && { RET_CODE=1; echo "macOS tests failed"; }
             [[ "${{ needs.linux_tests.result }}"          != 'success' ]] && { RET_CODE=1; echo "Linux tests failed"; }
             [[ "${{ needs.windows_tests.result }}"        != 'success' ]] && { RET_CODE=1; echo "Windows tests failed"; }