feat(cts): add this data source to check whether data can be transferred to the OBS bucket

[profoundwu]

What this PR does / why we need it:
add this data source to check whether data can be transferred to the OBS bucket
Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

1. add this data source to check whether data can be transferred to the OBS bucket

PR Checklist

• Tests added/passed.

make testacc TEST="./huaweicloud/services/acceptance/cts" TESTARGS="-run TestAccDataSourceCtsCheckBucket_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cts -v -run TestAccDataSourceCtsCheckBucket_basic -timeout 360m -parallel 4
=== RUN   TestAccDataSourceCtsCheckBucket_basic
=== PAUSE TestAccDataSourceCtsCheckBucket_basic
=== CONT  TestAccDataSourceCtsCheckBucket_basic
--- PASS: TestAccDataSourceCtsCheckBucket_basic (52.69s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cts       52.740s

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

[houpeng80]

Suggested change

	Use this data source to check whether data can be transferred to the OBS bucket.
	Use this data source to check whether data can be transferred to the configured OBS bucket.

[houpeng80]

should be change to resource