Provide a way to specify session for `cargo report` commands

[weihanglo]

Problem

In #15844 We have introduce two new unstable commands

• cargo report timings
• cargo report rebuilds

to report information for the latest build session.

However, people might want to look at arbitrary previous builds. but there is no way to specify session in other report command.

Proposed Solution

Introduce a way to inspect a specific session for cargo report timings and cargo report rebuilds. An --id flag might be a good starting point.

We already have cargo report sessions command that lists all previous sessions like this:

$ cargo +nightly report sessions -Zbuild-analysis
Session IDs for `/project/foo` (most recent first):

 - 20260101T212605604Z-0e981be2243ad433
 - 20260101T212542189Z-0e981be2243ad433
 - 20260101T211942857Z-0e981be2243ad433
 - 20251231T223721728Z-0e981be2243ad433
 - 20251231T223705871Z-0e981be2243ad433
 - 20251231T223625197Z-0e981be2243ad433
 - 20251231T223604944Z-0e981be2243ad433
 - 20251231T222913805Z-0e981be2243ad433
 - 20251231T222817405Z-0e981be2243ad433
 - 20251231T222718409Z-0e981be2243ad433

... and more (use --limit N to see more)

People can copy those ID and pass to --id.

Notes

No response