#3555 Content Sync: prevent timeout errors when sync-ing AEM cloud instances with large volumes of data

[YegorKozlov]

addresses #3555

AEM Cloud has the default read timeout of 60 seconds and ContentSync fails when collecting resources on the remote instance for longer than that.

With this PR the resources are collected in a Sling Job and the tool polls for completion every 3 seconds.

[github-actions]

Test Results

 2 997 files  +18   2 997 suites  +18   1h 37m 47s ⏱️ +19s
 1 913 tests +10   1 913 ✅ +10  0 💤 ±0  0 ❌ ±0 
17 217 runs  +90  17 211 ✅ +90  6 💤 ±0  0 ❌ ±0 

Results for commit c3646ec. ± Comparison against base commit 9112dc0.

This pull request removes 4 and adds 14 tests. Note that renamed tests count towards both.

com.adobe.acs.commons.contentsync.servlet.TestContentCatalogServlet ‑ testContentTreeDoesNotExist
com.adobe.acs.commons.contentsync.servlet.TestContentCatalogServlet ‑ testInvalidStrategyPid
com.adobe.acs.commons.contentsync.servlet.TestContentCatalogServlet ‑ testMissingRequiredParameters
com.adobe.acs.commons.contentsync.servlet.TestContentCatalogServlet ‑ testPageTree

com.adobe.acs.commons.contentsync.TestContentCatalog ‑ testCheckStatus_GivenUp
com.adobe.acs.commons.contentsync.TestContentCatalog ‑ testCheckStatus_InProgress
com.adobe.acs.commons.contentsync.TestContentCatalog ‑ testGetDelta
com.adobe.acs.commons.contentsync.TestContentCatalog ‑ testIsCompleteError
com.adobe.acs.commons.contentsync.TestContentCatalog ‑ testIsComplete_Succeeded
com.adobe.acs.commons.contentsync.TestContentCatalog ‑ testStartCatalogJob
com.adobe.acs.commons.contentsync.TestContentCatalogJobConsumer ‑ testBindUnbindStrategy
com.adobe.acs.commons.contentsync.TestContentCatalogJobConsumer ‑ testGetStrategy_InvalidStrategy
com.adobe.acs.commons.contentsync.TestContentCatalogJobConsumer ‑ testSave
com.adobe.acs.commons.contentsync.servlet.TestContentCatalogServlet ‑ testFailedJobHaveErrorMessage
…

♻️ This comment has been updated with latest results.

[simontunnat]

Sounds like a great solution, would really like for this to be reviewed and merged. :)