CI: Bootstrap no longer documents compiler crates

[fmease]

Bootstrap no longer documents any rustc_* / compiler/ crates or rustdoc in CI.
The index now only contains a meager 20 or so crates.
This has to have regressed fairly recently.

[Nemo157]

It regressed in the latest nightly, we have CI tests on docs.rs checking for some of these and the last daily test succeeded.

[ChrisDenton]

If I'm reading the commit history right there were a number of PRs that touched one of CI, bootstrap or rustdoc itself:

• rustdoc: elide cross-crate default generic arguments #112463
• bootstrap: bump fd-lock, clap and windows #116939
• update which targets we test Miri on #117267
• pass CODEGEN_BACKENDS to docker #117328
• More rustc_interface cleanups #117376
• improve and fix x install #117383

[Mark-Simulacrum]

This appears to have regressed in #117328... but I'm pretty confused by that.

$ for commit in $(git log --first-parent --format=%H | head -n30); do echo $commit; curl -sI "https://ci-artifacts.rust-lang.org/rustc-builds/$commit/rustc-docs-nightly-x86_64-unknown-linux-gnu.tar.xz" | grep content-length; done
ffb7ed9fa420e9bcd98d84b431b2009445b7b967
content-length: 5454792
650991d62c3a2c80ba27009d06839adbb038bf5e
content-length: 5456880
a395214a3a88be976eec9256987d5eb6b3584bdc
content-length: 5454420
31bc7e2c47e82798a392c770611975a6883132c8
content-length: 5456600
236ac911de2f4b6210ba99e25c6c4843c9381a1a
content-length: 5454984
e6e931dda5fffbae0fd87c5b1af753cc95556880
content-length: 5468104
6d1fc53cf4f61b0dce5fc84cebae3b9fb8a45436
content-length: 5468832
e324cf0f73f09388d494986550f46dc9e12badd3
content-length: 5468796
91bbdd927a5e53a2fe126304fe8adbedf339616c
content-length: 5468436
1dfb6b162be402d8ca37e8aad4f58898b44e3a15
content-length: 5468796
bcb5798dd890a691644af9d371f3bd7fcc465584
content-length: 22395756
608e9682f0a6482903de8d3332770104a0ad943c
content-length: 22390916
ec2b311914a4880235862f3cd65fe24e92e6d3a5
content-length: 22391560
88ae8c93854a1a67c6c0a45971c7198477456c33
content-length: 22396416
83c9732e0c7e1cae5f039677da4c51ee1d9b19b0
content-length: 22393792
160fd3ceb5143100d4e06f324b02af1f9e786372
content-length: 22375124
bbcc1691a4646a6d2ebb2189bdff5b878407fbe6

[lqd]

This appears to have regressed in #117328... but I'm pretty confused by that.

Since #117328 mostly allowed #81746 to have an effect, it could be that the issue is in #81746.

[Noratrieb]

cc @bjorn3 and also @onur-ozkan maybe you happen to have an idea too