Use anyhow more idiomatically (#31052)

https://github.com/zed-industries/zed/issues/30972 brought up another
case where our context is not enough to track the actual source of the
issue: we get a general top-level error without inner error.

The reason for this was `.ok_or_else(|| anyhow!("failed to read HEAD
SHA"))?; ` on the top level.

The PR finally reworks the way we use anyhow to reduce such issues (or
at least make it simpler to bubble them up later in a fix).
On top of that, uses a few more anyhow methods for better readability.

* `.ok_or_else(|| anyhow!("..."))`, `map_err` and other similar error
conversion/option reporting cases are replaced with `context` and
`with_context` calls
* in addition to that, various `anyhow!("failed to do ...")` are
stripped with `.context("Doing ...")` messages instead to remove the
parasitic `failed to` text
* `anyhow::ensure!` is used instead of `if ... { return Err(...); }`
calls
* `anyhow::bail!` is used instead of `return Err(anyhow!(...));`

Release Notes:

- N/A

crates/migrator/src/migrator.rs

@@ -14,7 +14,7 @@
 //!
 //! You only need to write replacement logic for x-1 to x because you can be certain that, internally, every user will be at x-1, regardless of their on disk state.
 
-use anyhow::{Context, Result};
+use anyhow::{Context as _, Result};
 use std::{cmp::Reverse, ops::Range, sync::LazyLock};
 use streaming_iterator::StreamingIterator;
 use tree_sitter::{Query, QueryMatch};