Revert "Port the Azure Resource Explorer extension to core." (#2770)

* Revert "change how query plan is handled (#2735)"

This reverts commit 0693080630.

* Revert "center the icon (#2760)"

This reverts commit 75d27837c2.

* Revert "Alanren/edit data improvement (#2748)"

This reverts commit 597f29e90a.

* Revert "Port the Azure Resource Explorer extension to core. (#2701)"

This reverts commit a77bb50b9e.

extensions/azurecore/resources/light/subscription.svg

@@ -1 +0,0 @@
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