Add suggested package checks to tests

tests/testthat/test-BASiCSParams.R

tests/testthat/test-MFAEstimate.R

tests/testthat/test-MFAParams.R

tests/testthat/test-PhenoParams.R

tests/testthat/test-SCDDParams.R

tests/testthat/test-SparseDCParams.R

tests/testthat/test-ZINBParams.R

tests/testthat/test-mfa-simulate.R

tests/testthat/test-pheno-simulate.R

tests/testthat/test-phenoEstimate.R

tests/testthat/test-scDD-simulate.R

tests/testthat/test-sparseDC-simulate.R

tests/testthat/test-sparseDCEstimate.R

tests/testthat/test-zinb-simulate.R