feat(workspace/app): add a new data source to query original policy

[wuzhuanhong]

What this PR does / why we need it:

Add a new data source(huaweicloud_workspace_app_original_policy) to query the original policy of the Workspace APP.

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:

add a new data source.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o workspace -f TestAccDataAppOriginalPolicy_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/workspace" -v -coverprofile="./huaweicloud/services/acceptance/workspace/workspace_coverage.cov" -coverpkg="./huaweicloud/services/workspace" -run TestAccDataAppOriginalPolicy_basic -timeout 360m -parallel 10
=== RUN   TestAccDataAppOriginalPolicy_basic
=== PAUSE TestAccDataAppOriginalPolicy_basic
=== CONT  TestAccDataAppOriginalPolicy_basic
--- PASS: TestAccDataAppOriginalPolicy_basic (18.61s)
PASS
coverage: 3.0% of statements in ./huaweicloud/services/workspace
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/workspace 19.330s coverage: 3.0% of statements in ./huaweicloud/services/workspace

• 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 <<<<<<

[ruwenqiang123]

LGTM

[wuzhuanhong]

./scripts/coverage.sh -o workspace -f TestAccDataAppOriginalPolicy_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/workspace" -v -coverprofile="./huaweicloud/services/acceptance/workspace/workspace_coverage.cov" -coverpkg="./huaweicloud/services/workspace" -run TestAccDataAppOriginalPolicy_basic -timeout 360m -parallel 10
=== RUN TestAccDataAppOriginalPolicy_basic
=== PAUSE TestAccDataAppOriginalPolicy_basic
=== CONT TestAccDataAppOriginalPolicy_basic
--- PASS: TestAccDataAppOriginalPolicy_basic (12.26s)
PASS
coverage: 2.9% of statements in ./huaweicloud/services/workspace
ok github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/workspace 13.612s coverage: 2.9% of statements in ./huaweicloud/services/workspace

[Alice1319]

LGTM

[Lance52259]

/approve
/lgtm

[github-ci-robot]

This PR has been approved by: @Lance52259

/approve
/lgtm