[TASK] Mitigate PHP 8.4.0-RC1 breaking changes

Note that this change addresses three different issues, which
need to be done in one step, otherwise none of isolated patches
would get a +1 CI verification:

* Alignment for changed `$escape` parameter handling of CSV
  related methods, which must be avoided with PHP versions below
  8.4.0-beta5, but is required as of PHP 8.4.0-RC1.
* This `$escape` issue needs to be addressed directly in
  the `typo3/testing-framework` and thus needs a raised
  dependency directly.
* PHP 8.4.0.0-RC1 also deprecated the `E_STRICT` constant,
  which needs to be addressed directly.

With [1] the `$escape` parameter for the following method calls

* `str_getcsv()`
* `fputcsv()`
* `fgetcsv()`

must be provided as a 1 character long value. Omitting and
using the default value will emit a PHP deprecation [2] warning
as of PHP 8.4.0-RC1, for example:

  str_getcsv(): the $escape parameter must be provided
  as its default value will change

To mitigate this, PHP recommends following:

  It must be passed explicitly either positionally or
  via named arguments.

This change adjusts all occurences (function calls) and ensures
that the `$escape` parameter is explicitly provided via
specifying all parameters up to that position and not
using a `named arguments` approach for easier backporting.

The TYPO3 testing framework also needs to be aligned to
mitigate `fgetcsv()` issues, and is raised in the same
step - otherwise none of these changes would get a green
CI pipeline run.

The following testing-framework updates are adjusted:

* main: simple update `main` pointer
* 12.4: Raise to tag `8.2.2`
* 11.5: Raise to tag `6.16.10`

Used command(s):

> composer update "typo3/testing-framework"

Additionally, PHP 8.4.0-RC1 deprecated the `E_STRICT`
constant, which now emits a E_DEPRECATED which leads to
failed CI tests. This change introduces a core internal
constant with the same integer value, and replaces usages
with this constant to mitigate the E_DEPRECATION. This constant
can then be dropped with TYPO3 v14, preventing a breaking change
at this time. [3][4]

[1] php/php-src#15569
[2] https://github.com/php/php-src/blob/ebee8df27ed/UPGRADING#L617-L622
[3] https://github.com/php/php-src/blob/ebee8df27edf7/UPGRADING#L47-L49
[4] php/php-src#13053

Resolves: #105155
Releases: main, 12.4, 11.5
Change-Id: Ie8b7d46eeb75ba6e32c0e8f6e7e947775083cc15
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86371
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>

Author: sbuerk

Classes/Form/Wizard/SuggestWizardDefaultReceiver.php

@@ -266,7 +266,7 @@ protected function buildConstraintBlock(string $searchString)
      */
     protected function splitSearchString(string $searchString): array
     {
-        return str_getcsv($searchString, ' ');
+        return str_getcsv($searchString, ' ', '"', '\\');
     }
 
     /**