Add support for setting deletion_allowed on a transformation

[benashz]

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Relates OR Closes #0000

Release note for CHANGELOG:

Output from acceptance testing:

$ make testacc-ent TESTARGS='-v -test.count=1' TEST_PATH=./generated/...
make testacc TF_ACC_ENTERPRISE=1
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -v -test.count=1 -timeout 30m ./generated/...
?       github.com/hashicorp/terraform-provider-vault/generated [no test files]
=== RUN   TestDecodeBasic
--- PASS: TestDecodeBasic (1.04s)
=== RUN   TestDecodeBatch
--- PASS: TestDecodeBatch (0.95s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/decode    3.601s
=== RUN   TestEncodeBasic
--- PASS: TestEncodeBasic (1.18s)
=== RUN   TestEncodeBatch
--- PASS: TestEncodeBatch (1.01s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/encode    2.748s
=== RUN   TestAlphabetName
--- PASS: TestAlphabetName (1.92s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/alphabet    3.249s
=== RUN   TestRoleName
--- PASS: TestRoleName (1.94s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/role        3.557s
=== RUN   TestTemplateName
--- PASS: TestTemplateName (1.90s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/template    3.502s
=== RUN   TestTransformationName
--- PASS: TestTransformationName (1.87s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/transformation      3.560s

...

[vinay-gopalan]

Looks great!