feat(cbr/policy): enable_acceleration is an internal param now

[Lance52259]

What this PR does / why we need it:
Update the behavior of parameter enable_acceleration from public optional to internal optional.
Because the permission OP_GATED_CSBS_REP_ACCELERATION cannot be disabled on the custom side.

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. update the behavior of parameter enable_acceleration from public optional to internal optional.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o cbr -f TestAccPolicy
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/cbr" -v -coverprofile="./huaweicloud/services/acceptance/cbr/cbr_coverage.cov" -coverpkg="./huaweicloud/services/cbr" -run TestAccPolicy -timeout 360m -parallel 10
=== RUN   TestAccPolicy_basic
=== PAUSE TestAccPolicy_basic
=== RUN   TestAccPolicy_retention
=== PAUSE TestAccPolicy_retention
=== RUN   TestAccPolicy_replication
=== PAUSE TestAccPolicy_replication
=== CONT  TestAccPolicy_basic
=== CONT  TestAccPolicy_replication
=== CONT  TestAccPolicy_retention
--- PASS: TestAccPolicy_replication (12.74s)
--- PASS: TestAccPolicy_basic (20.61s)
--- PASS: TestAccPolicy_retention (20.91s)
PASS
coverage: 14.3% of statements in ./huaweicloud/services/cbr
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cbr       20.982s coverage: 14.3% of statements in ./huaweicloud/services/cbr

• 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 <<<<<<

[github-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This PR has been approved by: @Lance52259

[jinyangyang222]

/lgtm