gh-35462: Iterator over the minimal distance k dominating sets
Fixes #35461.
### :books: Description
Add parameter `k` to method `minimal_dominating_sets` to specify the
domination distance to consider.
On the way, we
- Change the default value of parameter `work_on_copy` to `False` to
avoid modifying the graph by default
- Fix the behavior when some vertices specified in parameter
`to_dominate` are not in the graph
### :memo: Checklist
<!-- Put an `x` in all the boxes that apply. It should be `[x]` not `[x
]`. -->
- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [x] I have updated the documentation accordingly.
### :hourglass: Dependencies
None
URL: https://github.com/sagemath/sage/pull/35462
Reported by: David Coudert
Reviewer(s): Travis Scrimshaw
