feat: support new target_account_contexts field in Catalog Management api

[benbuchanan]

Also removes old unused fields and fixes a bug with updating catalogs.

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Output from acceptance testing:

TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmCatalogBasic -timeout 700m
=== RUN   TestAccIBMCmCatalogBasic
--- PASS: TestAccIBMCmCatalogBasic (27.63s)
PASS
==> Checking that code complies with gofmt requirements...
=== RUN   TestAccIBMCmCatalogSimpleArgs
--- PASS: TestAccIBMCmCatalogSimpleArgs (42.90s)
PASS
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmCatalogDataSourceBasic -timeout 700m
=== RUN   TestAccIBMCmCatalogDataSourceBasic
--- PASS: TestAccIBMCmCatalogDataSourceBasic (28.77s)
PASS
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmCatalogDataSourceSimpleArgs -timeout 700m
=== RUN   TestAccIBMCmCatalogDataSourceSimpleArgs
--- PASS: TestAccIBMCmCatalogDataSourceSimpleArgs (26.43s)
PASS
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmOfferingBasic -timeout 700m
=== RUN   TestAccIBMCmOfferingBasic
--- PASS: TestAccIBMCmOfferingBasic (28.90s)
PASS
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmOfferingSimpleArgs -timeout 700m
=== RUN   TestAccIBMCmOfferingSimpleArgs
--- PASS: TestAccIBMCmOfferingSimpleArgs (44.00s)
PASS
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmOfferingDataSourceBasic -timeout 700m
=== RUN   TestAccIBMCmOfferingDataSourceBasic
--- PASS: TestAccIBMCmOfferingDataSourceBasic (30.83s)
PASS
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run TestAccIBMCmOfferingDataSourceSimpleArgs -timeout 700m
=== RUN   TestAccIBMCmOfferingDataSourceSimpleArgs
--- PASS: TestAccIBMCmOfferingDataSourceSimpleArgs (34.68s)
PASS

[benbuchanan]

@Rajesh-Pirati @hkantare