chore(naming): adjust product naming

[DariuszPorowski]

This pull request includes a series of changes to update the naming convention from "Fabric Terraform Provider" to "Microsoft Fabric Terraform Provider" across various files and documentation. The most important changes include updates to configuration files, documentation, and code comments to reflect the new naming convention.

Changes to naming convention:

• .devcontainer/devcontainer.json: Updated the name from "Fabric Terraform Provider" to "Terraform Provider".
• README.md: Updated the description to use "Microsoft Fabric Terraform Provider".
• internal/provider/provider.go: Updated log messages to reflect the new provider name.

Documentation updates:

• DEVELOPER.md: Updated the VS Code status bar message to "Dev Container: Terraform Provider".
• docs/auth/auth_app_reg_spn.md: Updated the display name in Azure CLI and PowerShell commands to "Microsoft Fabric Terraform Provider". [1] [2]
• docs/guides/getting_started.md: Updated various references to use "Microsoft Fabric Terraform Provider". [1] [2] [3]

Template updates:

• templates/auth/auth_app_reg_user.md.tmpl: Updated API permissions descriptions and consent display names to use "Microsoft Fabric Terraform Provider". [1] [2]
• templates/guides/getting_started.md.tmpl: Updated various references to use "Microsoft Fabric Terraform Provider". [1] [2] [3]
• templates/index.md.tmpl: Updated the page title and provider description to use "Microsoft Fabric Provider".