Add telemetry for chunk-dedup build artifacts uploads (microsoft#3375)

* Add telemetry for chunk-dedup build artifacts uploads

* fix tests

* better design

* cleanup

* Don't need this anymore

* cleanup

* cleanup

* fix test

* tryparse

Release 2.185.1

Fix 'Self-hosted agent cleaning source folder' issue without affectin…

…g env variables (microsoft#3318)

* Add L0 test

* Added tests

* Remove extra change

* Fix tests

* Fix one more case when variable value changed

* Fixed test

* Use HasMultipleCheckouts method instead of own implementation

* Fix nit

* Some code style improvements

* Added some comments

* Changed comments

* Code cleanup in tests

* Added check that the entered path does not correspond to the default location for this repository

* Fixed tests

* Added additional test

* Fixed nit

* Self-hosted agent cleaning source folder (microsoft#3237)

* Resolved review points

* Removed extra braces

* Rename method

Co-authored-by: Anatoly Bolshakov <anatoly.bolshakov@akvelon.com>

Release 2.184.2 hotfix PR (microsoft#3347)

* roll back git version

* fix release notes

* bump agent version

* spelling

* explain the reason for using 2.30.2

Update to use AME release pool

Introduce enforcement mode for task restrictions (microsoft#3329)

Introduce enforcement mode for task restrictions

Based on a feature variable, don't enforce restrictions
from task.json, or just warn, or warn and enforce normally.
Also support collecting telemetry on matching task
restrictions, so we can see where they'd be applied
before fully enabling them.

Revert "Self-hosted agent cleaning source folder (microsoft#3237)" (m…

…icrosoft#3298)

* Revert "Self-hosted agent cleaning source folder (microsoft#3237)"

This reverts commit 0906b74.

* Change agent version and release notes

* returned release notes

Revert "Self-hosted agent cleaning source folder (microsoft#3237)" (m…

…icrosoft#3296)

* Revert "Self-hosted agent cleaning source folder (microsoft#3237)"

This reverts commit 0906b74.

* Changed agent version and release notes updated

Fix NullReferenceException when poolName is null. Closes microsoft#3218…

… (microsoft#3256)

microsoft#3259 Update NodeJS to version 10.23.3 (microsoft#3260)

This fixed  microsoft#3259