Remove local plugin loading recommendation from v1.11.x version of developer documentation

[optik-aper]

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Description

As of v1.11.0 the plugin loading logic for testing plugins has been dropped according to the Packer changelog. The v1.11.x version of the developer documentation still recommends the now unsupported method as a way to test during development.

Use Case(s)

Being informed of behavior changes when they are made.