[SQL] Move server service level objectives to servers.json

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#1223

[codecov-io]

Codecov Report

Merging #1177 into master will decrease coverage by 0.23%.
The diff coverage is 25.97%.

@@            Coverage Diff             @@
##           master    #1177      +/-   ##
==========================================
- Coverage   55.18%   54.94%   -0.24%     
==========================================
  Files        2191     2204      +13     
  Lines       60958    61445     +487     
==========================================
+ Hits        33637    33762     +125     
- Misses      27321    27683     +362

Impacted Files	Coverage Δ
azure-mgmt-sql/azure/mgmt/sql/models/database.py	100% <ø> (ø)	⬆️
.../mgmt/sql/operations/failover_groups_operations.py	10.79% <10.79%> (ø)
azure-mgmt-sql/azure/mgmt/sql/models/__init__.py	100% <100%> (ø)	⬆️
azure-mgmt-sql/azure/mgmt/sql/version.py	100% <100%> (ø)	⬆️
...ure/mgmt/sql/models/sql_management_client_enums.py	100% <100%> (ø)	⬆️
...ure-mgmt-sql/azure/mgmt/sql/operations/__init__.py	100% <100%> (ø)	⬆️
...e-mgmt-sql/azure/mgmt/sql/sql_management_client.py	100% <100%> (ø)	⬆️
...tions/server_azure_ad_administrators_operations.py	14.54% <14.54%> (ø)
...t/sql/operations/vnet_firewall_rules_operations.py	15.84% <15.84%> (ø)
...e-mgmt-sql/azure/mgmt/sql/models/failover_group.py	35.71% <35.71%> (ø)
... and 22 more

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[lmazuel]

In #1193