backend/oss: Changes the DescribeEndpoint to DescribeEndpoints to fixes the unsupported sts bug

[xiaozhu36]

The API DescribeEndpoint does not support STS authorizing and using the DescribeEndpoints instead.

TF_ACC=1 go test -v ./internal/backend/remote-state/oss/ -run=TestBackend -timeout 120m
=== RUN   TestBackend_impl
--- PASS: TestBackend_impl (0.00s)
=== RUN   TestBackendConfig
    backend_test.go:48: TestBackendConfig on *oss.Backend with configs.synthBody{Filename:"<TestWrapConfig>", Values:map[string]cty.Value{"bucket":cty.StringVal("terraform-backend-oss-test"), "key":cty.StringVal("first.tfstate"), "prefix":cty.StringVal("mystate"), "region":cty.StringVal("cn-beijing"), "tablestore_endpoint":cty.StringVal("https://terraformstate.cn-beijing.ots.aliyuncs.com"), "tablestore_table":cty.StringVal("TableStore")}}
--- PASS: TestBackendConfig (0.58s)
=== RUN   TestBackendConfigWorkSpace
    backend_test.go:83: TestBackendConfig on *oss.Backend with configs.synthBody{Filename:"<TestWrapConfig>", Values:map[string]cty.Value{"bucket":cty.StringVal("terraform-backend-oss-test-81"), "key":cty.StringVal("first.tfstate"), "prefix":cty.StringVal("mystate"), "region":cty.StringVal("cn-beijing"), "tablestore_endpoint":cty.StringVal("https://terraformstate.cn-beijing.ots.aliyuncs.com"), "tablestore_table":cty.StringVal("TableStore")}}
--- PASS: TestBackendConfigWorkSpace (1.48s)
=== RUN   TestBackendConfigProfile
    backend_test.go:122: TestBackendConfig on *oss.Backend with configs.synthBody{Filename:"<TestWrapConfig>", Values:map[string]cty.Value{"bucket":cty.StringVal("terraform-backend-oss-test"), "key":cty.StringVal("first.tfstate"), "prefix":cty.StringVal("mystate"), "profile":cty.StringVal("default"), "region":cty.StringVal("cn-beijing"), "tablestore_endpoint":cty.StringVal("https://terraformstate.cn-beijing.ots.aliyuncs.com"), "tablestore_table":cty.StringVal("TableStore")}}
--- PASS: TestBackendConfigProfile (0.56s)
=== RUN   TestBackendConfig_invalidKey
--- PASS: TestBackendConfig_invalidKey (0.00s)
=== RUN   TestBackend
    backend_test.go:168: TestBackendConfig on *oss.Backend with configs.synthBody{Filename:"<TestWrapConfig>", Values:map[string]cty.Value{"bucket":cty.StringVal("terraform-remote-oss-test-60efea39"), "prefix":cty.StringVal("multi/level/path/")}}
    backend_test.go:173: TestBackendConfig on *oss.Backend with configs.synthBody{Filename:"<TestWrapConfig>", Values:map[string]cty.Value{"bucket":cty.StringVal("terraform-remote-oss-test-60efea39"), "prefix":cty.StringVal("multi/level/path/")}}
    testing.go:299: TestBackend: testing state locking for *oss.Backend
    testing.go:299: TestBackend: *oss.Backend: empty string returned for lock, assuming disabled
    testing.go:299: TestBackend: testing state locking for *oss.Backend
    testing.go:299: TestBackend: *oss.Backend: empty string returned for lock, assuming disabled
--- PASS: TestBackend (3.96s)
PASS
ok      github.com/hashicorp/terraform/internal/backend/remote-state/oss        7.852s

[jbardin]

Thanks @xiaozhu36!

[github-actions]

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