#3850 Fix checkboxes handling for custom fields in contact import

[NFC] 5.55 Release Notes first pass at sorting and annotating

(REF) LocaleTestTrait- Fix error about private static

[REF] Add in Unit test to demonstrate error when trying to import a c…

[REF] Fix importing contributions with a campaign id rather than a t…

[REF] Add in Unit test to demonstrate error when trying to import a campaign id int rather than name or label of the campaign

5.55.0 release notes initial run

Resolve Issue #3927: contact import failure of different related contact typess

Remove broken call to parent constructor (Issue #3932)

Fix language negotiation exception to be standard

Fix accidental revert of import batch size

[REF][PHP8.1] Fix test failure on civiimport unit test because sequen…

Ensure that class-index is up-to-date after toggling extensions (A)

[REF][PHP8.1] Fix test failure on civiimport unit test because sequence key and keys are using id not _id

Additional patches from Eileen

Overview
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We increased batch size to 50 in 5.52 but appear to have accidentally
re-set it to 5. This was presumably due to code being merged that
patched the code with the older value & hadn't picked up the new

Before
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Each batch is 5 records

After
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Each batch is 50 records

Technical Details
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There seems to be consensus this should be at least 50.
100 is also on the table but I went with Andy's comment
https://github.com/civicrm/civicrm-core/pull/24151#issuecomment-1284498891

The issue Andy points out about the 3 second delay between batches seems excessive
and worth digging into. There used to be a 30 second delay in the UI just to
let people really luxuriate in watching our batch screen - not sure
if that is still there?

[REF] Remove Reference to now moved CONTRIBUTORS.txt file blocking bu…

[REF][PHP8.1] Fix Extension Manager Module test failures on php8.1 du…

[REF] Fix passing null into string functions in translation BAO

[REF][PHP8.1] Fix Extension Manager Module test failures on php8.1 due to passing in null to dirname

Import summary field fix

Add psr0 to afform extensions

[REF] Update JQuery UI to 1.13.2

civicrm_generated after #24695