refactor(ims): refactor ims_evs_data_image resource code style

[jinyangyang222]

What this PR does / why we need it:

refactor ims_evs_data_image resource 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:

Create a resource using the old code package:

Execute terraform plan using new code package:

In summary, it can be considered that this reconstruction will have no impact on existing users.

Release note:

refactor `ims_evs_data_image` resource code style

PR Checklist

• Tests added/passed.

$ make testacc TEST="./huaweicloud/services/acceptance/ims" TESTARGS="-run TestAccEvsDataImage_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/ims -v -run TestAccEvsDataImage_basic -timeout 360m -parallel 4
=== RUN   TestAccEvsDataImage_basic
=== PAUSE TestAccEvsDataImage_basic
=== CONT  TestAccEvsDataImage_basic
--- PASS: TestAccEvsDataImage_basic (411.16s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/ims       411.211s

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    

  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found