[FEATURE] Save current workspace in ReferenceIndex

To reduce queries to accordant relations saved in the reference
index, add the current workspace that is used. This information
will be used later during publishing nested record sets (e.g.
for Inline Relational Record Editing).

Resolves: #56977
Releases: 6.2
Change-Id: I92851e243581a525bb99fafc9ed656fd613eeb82
[FEATURE] Introduce shadowColumnsForMovePlaceholders property

$TCA[<table>]['ctrl']['shadowColumnsForMovePlaceholders'] behaves
similar to shadowColumnsForNewPlaceholders but is only used for
move placeholders.

If shadowColumnsForMovePlaceholders is not defined in particular
for a table, but shadowColumnsForNewPlaceholders is defined,
then that value is used as a fallback - since that property
existed for a longer time already.

Resolves: #56994
Documentation: #56749
Releases: 6.2
Change-Id: Icdbd35234efae8162cfb2dc15a2838acd22370b1