Arm64/Sve: SveLoadMaskedUnOpTest.template needs more scenario

[kunalspathak]

Following scenarios are missing from this template and related templates that were copied over from it.

                // Validates passing an instance member of a class works
                test.RunClassFldScenario();

                // Validates passing the field of a local struct works
                test.RunStructLclFldScenario();

                // Validates passing an instance member of a struct works
                test.RunStructFldScenario();

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[kunalspathak]

@TIHan - once you are done with #102860, can you please add the remaining coverage?

[kunalspathak]

@a74nh @SwapnilGaikwad PTAL for .NET 9

[a74nh]

priority:2 for RC1 snap : Missing testing