Add more graphblas.update tests

[paul-tqh-nguyen]

This commit also adds a test that currently fails.

    // COM: TODO This doesn't work yet.
    // COM: input -> output(mask) { accumulate_operator, replace }
    // COM: 
    // COM: CHECK:      Test 70
    // COM: CHECK-NEXT: [_, 8.8, _, 11, _, _, _, _, _, _]
    // COM: 
    // COM: graphblas.print %c0 { strings=["Test 7"] } : index
    // COM: %26 = graphblas.dup %v1 : tensor<?xf64, #CV64>
    // COM: graphblas.update %v2 -> %26(%mask) { accumulate_operator = "plus", replace = true } : tensor<?xf64, #CV64> -> tensor<?xf64, #CV64>(tensor<?xf64, #CV64>)
    // COM: graphblas.print %26 { strings=[] } : tensor<?xf64, #CV64>

[coveralls]

Pull Request Test Coverage Report for Build 1680027968

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.889%

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Totals
Change from base Build 1594078109:	0.0%
Covered Lines:	4559
Relevant Lines:	5308

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💛 - Coveralls