Remove PascaLIGO (except parser) from compiler and tools

Motivation and Context

We spend some time to support Pascaligo in multiple places (e.g. in LSP its range formatting or completions) even despite its deprecated

Description

Remove everything related to Pascaligo except parser and previous passes

Component

• compiler
• website
• webide
• vscode-plugin
• debugger

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Performance improvement (non-breaking change that improves performance)
• None (change with no changelog)

Changelog

Remove the --deprecated flag that allowed users to work with PascaLIGO contracts. To compile a PascaLIGO contract you can use LIGO 0.73.0 with the --deprecated flag or an older LIGO version.

Checklist:

• If a new syntax has been introduced, put a message on slack ligo-lsp
• Changes follow the existing coding style (use dune @fmt to check).
• Tests for the changes have been added (for bug fixes / feature).
• Documentation has been updated.
• Changelog description has been added (if appropriate).
• Start titles under ## Changelog section with #### (if appropriate).
• There is no image or uploaded file in changelog
• Examples in changed behaviour have been added to the changelog (for breaking change / feature).