Remove rls and rust-analysis from components list.

[burakemir]

This is a documentation-only change.

Since rls and rust-analysis do not seem to be useful, removing those from the component list.

RLS was deprecated over a year ago. https://blog.rust-lang.org/2022/07/01/RLS-deprecation.html
The rust-analysis component seems to only contain a placeholder file with the contents

{"warning": "The `rust-analysis` component has been removed." }"

I checked a few occurrences in rustup toolchain manifest files, and they only seem to contain that "removed.json".

I believe no one will miss these things.

[Rustin170506]

cc: #3316

[Rustin170506]

Looks good to me.

[Rustin170506]

@burakemir Please rebase your branch with the latest master branch to fix the test.

[rbtcollins]

I think we should rearrange rather than remove these entries. Rustup installs both current and old versions of toolchains, and those components remain valid in older releases: the removal only affects newer channel metadata, not existing.

Something like

### Previous components

These components have been deprecated and are not published in new Rust releases.

<table here>

[rbtcollins]

Changes requested in my other comment

[burakemir]

Done.