[BUGFIX] Re-add highlighting of filter term in Svg Tree

This change re-adds the highlighting of filter
results in the Svg Trees, which was present
before in the Page Tree before it was built on SVG.

Due to the nature of SVG, it is rather complicated
to color the actual background of the text than the
text itself (using <tspan>), but still, the highlighting
is IMHO better than having no highlighting.

Resolves: #87743
Releases: master, 10.4
Change-Id: Ie37173149c8f9388194e63a07ae89eb2fc774f30
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68835


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>