Rollup merge of #101702 - jsha:static-files2, r=notriddle,GuillaumeGomez
rustdoc: add hash to filename of toolchain files
All static files used by rustdoc are now stored in static.files/ and their filenames include a hash of their contents. Their filenames no longer include the contents of the --resource-suffix flag. This clarifies caching semantics. Anything in static.files can use Cache-Control: immutable because any updates will show up as a new URL.
Invocation-specific files like crates-NN.js, search-index-NN.js, and sidebar-items-NN.js still get the resource suffix.
This has a useful side effect: once toolchain files aren't affected by resource suffix, it will become possible for docs.rs to include crate version in the resource suffix. That should fix a caching issue with `/latest/` URLs: https://github.com/rust-lang/docs.rs/issues/1593. My goal is that it should be safe to serve all rustdoc JS, CSS, and fonts with infinite caching headers, even when new versions of a crate are uploaded in the same place as old versions.
The --disable-minification flag is removed because it would vary the output of static files based on invocation flags. Instead, for rustdoc development purposes it's preferable to symlink static files to a non-minified copy for quick iteration.
Example listing:
```
$ cd build/x86_64-unknown-linux-gnu/doc/ && find . | egrep 'js$|css$' | egrep -v 'sidebar-items|implementors' | sort
./crates1.65.0.js
./rust.css
./search-index1.65.0.js
./source-files1.65.0.js
./static.files/ayu-
2bfd0af01c176fd5.css
./static.files/dark-
95d11b5416841799.css
./static.files/light-
c83a97e93a11f15a.css
./static.files/main-
efc63f77fb116394.js
./static.files/normalize-
76eba96aa4d2e634.css
./static.files/noscript-
5bf457055038775c.css
./static.files/rustdoc-
7a422337900fa894.css
./static.files/scrape-examples-
3dd10048bcead3a4.js
./static.files/search-
47f3c289722672cf.js
./static.files/settings-
17b08337296ac774.js
./static.files/settings-
3f95eacb845293c0.css
./static.files/source-script-
215e9db86679192e.js
./static.files/storage-
26d846fcae82ff09.js
```
Fixes #98413