azurerm_dynatrace_tag_rules: changing filtering_tag from Required to Optional

[jiaweitao001]

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Description

The filtering_tag attribute should be Optional instead of Required. This PR fixes this.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

=== RUN   TestAccDynatraceTagRules_basic
=== PAUSE TestAccDynatraceTagRules_basic
=== RUN   TestAccDynatraceTagRules_requiresImport
=== PAUSE TestAccDynatraceTagRules_requiresImport
=== CONT  TestAccDynatraceTagRules_basic
=== CONT  TestAccDynatraceTagRules_requiresImport
--- PASS: TestAccDynatraceTagRules_requiresImport (287.09s)
--- PASS: TestAccDynatraceTagRules_basic (288.82s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/dynatrace     276.234s

The related acc tests won't be able to run on team city, verification can only be done with service provided tenant.

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_dynatrace_tag_rules: changing filtering_tag from Required to Optional

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #31056

AI Assistance Disclosure

• AI Assisted - This contribution was made by, or with the assistance of, AI/LLMs

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the provider.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[sreallymatt]

Thanks @jiaweitao001 LGTM ✅

[github-actions]

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