Removes older sql schema versions (4.sql,5.sql,6.sql)

[mahajan-xor]

Description

This PR removes older sql schema versions (4.sql,5.sql,6.sql).

• Also removed below class files under Features.Storage.TvpRowGeneration folder to solve build error issues
  ReferenceSearchParameterV1RowGenerator
  ReferenceTokenCompositeSearchParameterV1RowGenerator

Related issues

Addresses [user story #].
User Story 104513: Remove old schema versions from FHIR solution

Testing

NA

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)