fix(user-timing): fix clearing marks/measures by name (#32120)

This fixes several tests in
[wpt/user-timing](https://wpt.fyi/results/user-timing?label=master&product=chrome%5Bexperimental%5D&product=firefox%5Bexperimental%5D&product=safari%5Bexperimental%5D&product=servo&aligned)
by fixing some logic errors in how marks/measures are cleared (via
[`clearMarks`](https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMarks)
and
[`clearMeasures`](https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMeasures)).

There are two changes:

1. Fix the boolean logic in `clear_entries_by_name_and_type` so that,
when `clearMarks('foo')` or `clearMeasures('foo')` is called, the
presence of the entry name correctly filters based on existing entry
names.
2. Make the `entry_name` param a `DOMString` rather than an
`Option<DOMString>` since every API call has it as `Some` anyway, and
I'm not aware of any [Performance
APIs](https://developer.mozilla.org/en-US/docs/Web/API/Performance)
where you can clear all entries regardless of type. (This is not
strictly required for the fix, but I think it makes the code easier to
read.)

~~I also considered adding the expected WPT results using `mach
update-wpt`. But I'm not sure if you want these changes, since the
expectations are currently missing (i.e. `tests/wpt/meta/user-timing`
does not exist).~~ (_Update: added!_)

For the record, this PR fixes the following tests:

- `clearMarks.html.ini`
- `clearMeasures.html.ini`
- `clear_non_existent_mark.any.js.ini`
- `clear_non_existent_measure.any.js.ini`
- `clear_one_mark.any.js.ini`
- `clear_one_measure.any.js.ini`

~~In case you do want these meta files, here they are:
https://github.com/nolanlawson/servo/commit/510e6146ba01bae4f4aafda8754718e24ce6e868~~

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