feat: add framework for listing updated components

[GideonBear]

What does this PR do

Closes #943 (I am planning to open a tracking issue for implementing this for all steps where it is possible if this is merged.)

• Adds the framework for listing updated components in the summary.
  • The step can specify just the thing that was updated, or also the version it was updated from/to or both.
• Implements that for uv (self-updating only for now)
• Adds references to this to the "new step" issue and PR templates.

What do you think @SteveLauC? This is non-disruptive for steps that don't yet or can't support it, but opens up the possibility to implement this for steps where it is very useful. Note that for some steps, machine-readable output is available (e.g. apt-get) and can be used instead of regexes. We can also PR to the tools themselves to support outputting in a machine-readable format. (maybe a good idea for uv, which already supports --output-format=json on some commands)

Example: (cinnamon_spices included to show what it looks like for a step that does not support it (yet))

$ cargo run -- --only uv --only cinnamon_spices
── 11:18:45 - Cinnamon spices ──────────────────────────────────────────────────
There are no Spice updates

── 11:18:46 - uv ───────────────────────────────────────────────────────────────
info: Checking for updates...
success: Upgraded uv from v0.7.1 to v0.7.2! https://github.com/astral-sh/uv/releases/tag/0.7.2
Nothing to upgrade

── 11:18:50 - Summary ──────────────────────────────────────────────────────────
Cinnamon spices: OK
uv: OK: Updated:
- (self-update) uv from v0.7.1 to v0.7.2
$ cargo run -- --only uv --only cinnamon_spices
── 11:18:52 - Cinnamon spices ──────────────────────────────────────────────────
There are no Spice updates

── 11:18:53 - uv ───────────────────────────────────────────────────────────────
info: Checking for updates...
success: You're on the latest version of uv (v0.7.2)
Nothing to upgrade

── 11:18:53 - Summary ──────────────────────────────────────────────────────────
Cinnamon spices: OK
uv: OK: No updates found

Standards checklist

• The PR title is descriptive
• I have read CONTRIBUTING.md
• Optional: I have tested the code myself
• If this PR introduces new user-facing messages they are translated

[GideonBear]

See discussion in #943