IBX-7346: Reindexed reverse-related content after deleting source content

[barw4]

Question	Answer
JIRA issue	IBX-7346
Type	bug
Target Ibexa version	v3.3
BC breaks	no

Currently, content that is deleted and is used in relation to other content won't be removed from search engines fields, however, it should. Therefore, in this PR, reverse relations are fetched when deleting TrashItem and later those contents are reindexed again to account for destination content deletion.

Two specific actions are handled here and those are:

• emptyTrash
• deleteTrashItem

Checklist:

• Provided PR description.
• Tested the solution manually.
• Provided automated test coverage.
• Checked that target branch is set correctly (master for features, the oldest supported for bugs).
• Ran PHP CS Fixer for new PHP code (use $ composer fix-cs).
• Asked for a review (ping @ezsystems/engineering-team).

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[tomaszszopinski]

QA approved on IbexaDXP 3.3 commerce.