azuredevops_elastic_pool support set time_to_live_minutes to 0

[xuzhang3]

All Submissions:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• Have you checked to ensure there aren't other open PRs for the same update/change?

What about the current behavior has changed?

Issue Number: #884

=== RUN   TestAccElasticPool_basic
--- PASS: TestAccElasticPool_basic (111.87s)
=== RUN   TestAccElasticPool_update
--- PASS: TestAccElasticPool_update (150.88s)
=== RUN   TestAccElasticPool_requiresImportErrorStep
--- PASS: TestAccElasticPool_requiresImportErrorStep (111.67s)
PASS
ok      github.com/microsoft/terraform-provider-azuredevops/azuredevops/internal/acceptancetests        374.691s

Does this introduce a change to go.mod, go.sum or vendor/?

• Yes
• No

Does this introduce a breaking change?

• Yes
• No

Any relevant logs, error output, etc?

(If it’s long, please paste to https://ghostbin.com/ and insert the link here.)

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