Regionalize network_services_tls_route resource with global as default value

[modular-magician]

Add the location field to TLSRoute resource.

Fixes hashicorp/terraform-provider-google#26502

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Release Note Template for Downstream PRs (will be copied)

compute: added field `location` to resource `google_network_services_tls_route`

Derived from GoogleCloudPlatform/magic-modules#16755