JuliaOpt / JuMP.jl / 8247

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Create a version of method delete that deletes a vector of variables. (#2135)

* Create a version of method delete that deletes a vector of variables. This calls the version of MOI.delete that also works over a vector of variables, and is specialized by solvers for greater performance than repeteadely calling the single variable version.

* Added tests for batch deletion of variables.

* Adapted the batch deletion test to be executed over JuMPExtension too. Implemented the batch deletion in JuMPExtension to pass the test. Increased the coverage of the test to include the cases a Exception is thrown (bad paths).

* Three small fixes/enhancements suggested by @mlubin.

* Fixed two small typos.

* Implemented trivial fallback for  method that deletes multiple constraints. JuMPExtension implementation and the tests for both JuMP and JuMPExtensions were also added.

* Changed the multiple constraint deletion method to call the MOI fallback as @odow noted. Ran the tests, code is working.

* Changes in the documentation asked by @mlubin.

* Enhancing documentation by giving a one-liner for the user to check if this is the case.

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