Apply feedback (#24757)

* Update to autorest 4.x
Update to Azure Policy 2023-04-01
Move to non-versioned interface types
Complete full test suite for existing cmdlets
Few bug fixes
Add completer for Location parameter
Fix record/playback, remove -LiveOnly tags
Make test names repeatable to work with record/playback
Implement resource group functions that became inaccessible
Fix test failures due to default parameter injection

* Clean up some transforms in README
Remove unsupported (for now) parameters
Streamline common test code
Move common test code to utils.ps1
Add serialization of test variables to env.json

* Remove extra parameters from Get-AzPolicyAssignment
Rerecord the tests

* Fix $testFilesFolder calculation to work on macOS/linux.

* Hide generated parameter sets for New-*
Correct definitions, validation, and tests for New-AzPolicyAssignment parameters
Re-record all tests

* Replace Get-AzContext with Utils\Get-SubscriptionIdTestSafe
Move to autorest 4.0.690
Update managed identity properties to match generation changes
Remove several parameter transforms no longer needed
Rerecord all tests
91 tests still failing on -Playback with the same signature

* Remove location completer from exports/docs/examples/help

* Improve location completer tests

* Remove transforms for Scope and Id parameters no longer needed
Update cmdlets to use Scope and Id directly
Rerecord all tests
All tests pass in -Record mode
Failures in -Playback mode unchanged

* Change location completer to lazy load (vs. module load)
Preserve "extra" input parameters in Update-* calls to Get-* in order to support -Playback test mode
Tag test files that don't support -Playback mode as LiveOnly
Rerecord all recording files

* Minor updates for consistency
Rerecord all tests
Move 4 test files back to LiveOnly

* Updates for consistency and to fix tests
Make changes to ensure consistent and valid handling of $location
Rerecord tests

* Fix bad merge
Rerecord two test files

* Re-record tests

* Implement feedback:
 - Add ResourceId to Get-AzPolicy[Set]Definition
 - Change -BuiltIn to -Builtin
 - Add -InputObject parameter to Update-* cmdlets
 - Control ErrorAction behavior for Get-AzPolicy[Set]Definition
Deprecate the -BackwardCompatible switch