[KeyVault] updating autorest generated code from 7.0-preview spec

[schaabs]

• updating the generated code
• removing the deprecated 'generated' namespace in newer major version

[schaabs]

The generated code updates in this PR are derived from changes in Azure/azure-rest-api-specs#2367

[codecov-io]

Codecov Report

Merging #1883 into keyvault_1.0_preview will decrease coverage by 0.03%.
The diff coverage is 75.82%.

@@                   Coverage Diff                    @@
##           keyvault_1.0_preview    #1883      +/-   ##
========================================================
- Coverage                 52.71%   52.68%   -0.04%     
========================================================
  Files                      4645     4643       -2     
  Lines                    114709   114660      -49     
========================================================
- Hits                      60471    60403      -68     
- Misses                    54238    54257      +19

Impacted Files	Coverage Δ
azure-keyvault/azure/keyvault/models/__init__.py	100% <ø> (ø)	⬆️
...e/keyvault/models/certificate_issuer_item_paged.py	100% <ø> (ø)	⬆️
...keyvault/azure/keyvault/models/deleted_key_item.py	100% <ø> (ø)	⬆️
.../azure/keyvault/models/deleted_certificate_item.py	100% <ø> (ø)	⬆️
...yvault/azure/keyvault/models/deleted_key_bundle.py	100% <ø> (ø)	⬆️
...e-keyvault/azure/keyvault/models/key_item_paged.py	100% <ø> (ø)	⬆️
.../keyvault/models/deleted_certificate_item_paged.py	100% <ø> (ø)	⬆️
...zure/keyvault/models/storage_account_item_paged.py	80% <ø> (ø)	⬆️
...ult/azure/keyvault/models/deleted_secret_bundle.py	100% <ø> (ø)	⬆️
...vault/azure/keyvault/models/deleted_secret_item.py	100% <ø> (ø)	⬆️
... and 73 more

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