Normalize IP, DB, OS, IPv4, and IPv6 names in the management generator

[weikanglim]

Parent: #61941

Add boundary-aware final-name normalization in Azure.Generator.Management for:

• Ip -> IP
• Db -> DB
• Os -> OS
• Ipv4 and IpV4 -> IPv4
• Ipv6 and IpV6 -> IPv6

Apply it to model, extensible-enum/union type, enum type, and model-property providers. Replace repeated occurrences and preserve longer words such as Oslo, Ipsum, Osmosis, and dbz. Keep explicit IPV4/IPV6 spellings unchanged for compatibility.

Acceptance criteria

• Normalization runs on the final provider name after existing structural transforms.
• Positive, repeated, already-canonical, negative-boundary, and interaction tests pass.
• Enum values, clients, operations, and parameters are excluded from this task.
• No generated SDK source or API specification files are modified.

Measured potential cleanup: 945 C# decorators occupying 3,181 physical client.tsp lines.