[BUGFIX] Add `_ga` to `excludedParameters`

This commit adds `_ga` to the `excludedParameters` configuration used
for the cHash calculation.

Resolves: #103435
Releases: main, 12.4, 11.5
Change-Id: I5c79c9264d1d8f09f45db947d714d27b3da4fb00
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83534


Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>