Fixes the issue described in
symfony/symfony#48682

Further align the signature of the innerText() method with the text()
method by adding optional default value and normalizeWhitespace
arguments and extract normalizing whitespace to a shared method.

…rawler::innerText()` and make it return the first non-empty text (otsch)

This PR was merged into the 6.3 branch.

Discussion
----------

[DomCrawler] Add argument `$normalizeWhitespace` to `Crawler::innerText()` and make it return the first non-empty text

This is a new PR instead of #48684 with target branch 6.3 as requested.

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #48682
| License       | MIT

Commits
-------

bb0c214 [DomCrawler] Add argument `$normalizeWhitespace` to `Crawler::innerText()` and make it return the first non-empty text

…ty string (NanoSector)

This PR was submitted for the 6.4 branch but it was merged into the 6.3 branch instead.

Discussion
----------

[Crawler] Fix regression where cdata nodes will return empty string

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A
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Fixes a regression caused by the fix to #48682 where `<script>` tags would return empty string on the innerContent call, where in 6.2 this did work.

Attached is a zipped PHPUnit test case used to verify the regression on 6.2 with a screenshot of its result.

[CrawlerInnerTextTest.zip](https://github.com/symfony/symfony/files/10567760/CrawlerInnerTextTest.zip)
![image](https://user-images.githubusercontent.com/1280380/216297235-1eda66d3-6768-4e49-9812-2857cff67086.png)

Commits
-------

23c1dda [Crawler] Fix regression where cdata nodes will return empty string