bug #45351 [WebProfilerBundle] Log section minor fixes (missing "notice" filter, log priority, accessibility) (Amunak)

This PR was squashed before being merged into the 5.4 branch.

Discussion
----------

[WebProfilerBundle] Log section minor fixes (missing "notice" filter, log priority, accessibility)

| Q             | A
| ------------- | ---
| Branch?       | 5.4 <!-- see below -->
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | #42195 (related)
| License       | MIT
| Doc PR        | ~

This fixes minor front-end issues with the redesigned Log section in WebProfilerBundle.

Marking as bugfix, since technically the redesign removed some features without documenting it - the log level is now visible even for low level logs (debug, notice, info). I have also added the missing "notice" filter and made sure that when a filter is missing the message is shown (fail-safe).

I have also implemented accessibility fixes mentioned in the original PR (#42195) by @stof.

I did not add tests because I have no idea where or how - currently the profiler front-end is not tested (or at least the log section). These changes do not affect the logic behind the panel in a way that could be easily tested.

Screenshot of the changes: notice the visible log levels and added "notice" filter:

![Screenshot of the changes](https://user-images.githubusercontent.com/781546/152992378-89452512-7b94-40b7-9d8e-8f94acc4d058.png)

Commits
-------

1c3b2661cf [WebProfilerBundle] Log section minor fixes (missing "notice" filter, log priority, accessibility)

Author: fabpot

DataCollector/LoggerDataCollector.php

@@ -133,6 +133,7 @@ public function getFilters()
             'priority' => [
                 'Debug' => 100,
                 'Info' => 200,
+                'Notice' => 250,
                 'Warning' => 300,
                 'Error' => 400,
                 'Critical' => 500,