[BUGFIX] Avoid reference index records for images in RTE fields

Since images in RTE fields are handled as relations to sys_file
records adding references to the reference index for the concrete
image paths are obsolete and causes trouble with impexp.

Resolves: #56811
Releases: 6.2
Change-Id: I26a2531f417ff8b628b69156a3a2236c99960d5e
Reviewed-on: https://review.typo3.org/28292
Reviewed-by: Stanislas Rolland
Tested-by: Stanislas Rolland
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot
Reviewed-by: Marc Bastian Heinrichs
Tested-by: Marc Bastian Heinrichs
[TASK] Declare getThisScript() in ElementBrowser as public

To make work in hooks easier, the method should be public

Resolves: #56721
Releases: 6.2
Change-Id: Ib0a0f17d5f9384a04a125ef08a079f4c272eddae
Reviewed-on: https://review.typo3.org/28337
Reviewed-by: Alexander Stehlik
Tested-by: Alexander Stehlik
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Revert "[TASK] Declare getThisScript() in ElementBrowser as public"

This reverts commit b2756fe7826d62fdc8442c887010890c268eabd8

A comment of Helmut Hummel was suggested, which was still missing.
This change will be repushed.

Releases: 6.2
Change-Id: I518af35f562350f9dde39678de52f69d58344677
Reviewed-on: https://review.typo3.org/28478
Reviewed-by: Markus Klein
Tested-by: Markus Klein
[BUGFIX] Avoid superfluous IRRE child record duplication

If copying a page, all records on that page will be copied to
the accordant destination page. IRRE parent-child structures
are cloned along the way as well. However, if a table (that is
defined a IRRE child) is processed before the accordant parent
record, the parent itself will duplicate its children again.
This behaviour leads to superfluous duplicates and is wrong.

A check in DataHandler::copyRecord_procBasedOnFieldType() now
ensures that records are only copied once during the accordant
DataHander copy process.

Resolves: #44795
Releases: 6.2
Change-Id: Ia1e4129432f37c0dd6bfedb5fd69394e2c244d34
Reviewed-on: https://review.typo3.org/26552
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader
[TASK] Disable notifications

Change-Id: I7219b897d73aedf91f6c30fd9b18c8c98d5032bc