refactor(cdn/cache_url_tasks): refactor the cache_url_tasks data source code style

[jinyangyang222]

What this PR does / why we need it:

refactor the cache_url_tasks data source code style

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:

refactor the `cache_url_tasks` data source code style

PR Checklist

• Tests added/passed.

$ export HW_CDN_DOMAIN_URL=xxxxxxxxxx
$ make testacc TEST="./huaweicloud/services/acceptance/cdn" TESTARGS="-run TestAccDataSourceCacheUrlTasks_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cdn -v -run TestAccDataSourceCacheUrlTasks_basic -timeout 360m -parallel 4
=== RUN   TestAccDataSourceCacheUrlTasks_basic
=== PAUSE TestAccDataSourceCacheUrlTasks_basic
=== CONT  TestAccDataSourceCacheUrlTasks_basic
--- PASS: TestAccDataSourceCacheUrlTasks_basic (11.83s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cdn       11.869s

Test case coverage

• 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 <<<<<<

[deer-hang]

/approve
/lgtm

[github-ci-robot]

This PR has been approved by: @deer-hang

/approve
/lgtm