azurerm_container_registry - remove ConfigModeAttr for 4.0

[stephybun]

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Description

Removed ConfigModeAttr from network_rule_set, also extends some of the tests to ensure that downgrading the sku is still possible without ConfigModeAttr.

Testing

Test results in 4.0 mode

--- PASS: TestAccContainerRegistry_basicManagedPremium (138.83s)
--- PASS: TestAccContainerRegistry_basicManagedStandard (163.46s)
--- PASS: TestAccContainerRegistry_networkRuleBypassOption (165.31s)
--- PASS: TestAccContainerRegistry_zoneRedundancy (166.06s)
--- PASS: TestAccContainerRegistry_requiresImport (199.71s)
--- PASS: TestAccContainerRegistry_basic (203.37s)
--- PASS: TestAccContainerRegistry_anonymousPull (211.27s)
--- PASS: TestAccContainerRegistry_complete (113.53s)
--- PASS: TestAccContainerRegistry_geoReplicationRegionEndpoint (221.55s)
--- PASS: TestAccContainerRegistry_networkAccessProfileUpdate (229.23s)
--- PASS: TestAccContainerRegistry_dataEndpoint (230.05s)
--- PASS: TestAccContainerRegistry_basic2Premium2basic (239.94s)
--- PASS: TestAccContainerRegistry_networkAccessProfileIp (261.36s)
--- PASS: TestAccContainerRegistry_geoReplicationZoneRedundancy (280.18s)
--- PASS: TestAccContainerRegistry_update (373.14s)
--- PASS: TestAccContainerRegistry_encryption (380.75s)
--- PASS: TestAccContainerRegistry_geoReplicationLocation (424.34s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/containers    427.181s

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)

Closes #20721

Note

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

[mbfrahry]

LGTM