Rename project components from 'OperatorTemplate' to 'KubeSqlServer'

[josephaw1022]

This issue tracks the migration from the placeholder OperatorTemplate naming convention to the official KubeSqlServer branding across the entire repository. This operation involves a broad rename of directories, files, namespaces, and configuration references to maintain consistency and clarity.

Requirements

1. Directory and File Renaming

• Solution File: Rename OperatorTemplate.sln to KubeSqlServer.sln.
• Project Directories: Rename all src/OperatorTemplate.* and src/tests/OperatorTemplate.* directories to match the KubeSqlServer.* pattern.
• Project Files: Rename all .csproj files to reflect the new project names.

2. Source Code and Configuration Updates

• Namespaces: Update all C# namespaces from OperatorTemplate.* to KubeSqlServer.*.
• Project References: Update cross-project references in .csproj files and the solution file.
• Taskfiles: Update Taskfile.yml and nested Taskfile.yaml files (found in dev/, deploy/, etc.) to use updated paths and descriptive names.
• GitHub Actions: Update container build paths and project references in workflows within .github/workflows/.
• Infrastructure: Update Containerfile, scripts, and the root README.md.

Verification Criteria

• Solution builds successfully via dotnet build.
• All unit tests pass via dotnet test.
• Container images build successfully using the updated Taskfile commands.
• Deployment scripts and Helm chart tasks remain functional with new filesystem paths.